Atomic bombings of
Hiroshima and Nagasaki

From Wikipedia, the free encyclopedia

The mushroom cloud over Hiroshima
after the dropping of Little Boy




The Fat Man mushroom cloud resulting
from the nuclear explosion over
Nagasaki rises 18 km (11 mi, 60,000 ft)
into the air from the hypocenter.


The atomic bombings of Hiroshima and Nagasaki were nuclear attacks near the end of World War II against the Empire of Japan by the United States at the order of U.S. President Harry S. Truman on August 6 and 9, 1945. After six months of intense fire-bombing of 67 other Japanese cities, the nuclear weapon "Little Boy" was dropped on the city of Hiroshima on Monday,[1] August 6, 1945, followed on August 9 by the detonation of the "Fat Man" nuclear bomb over Nagasaki. These are to date the only attacks with nuclear weapons in the history of warfare.[2]

The bombs killed as many as 140,000 people in Hiroshima and 80,000 in Nagasaki by the end of 1945,[3] roughly half on the days of the bombings. Since then, thousands more have died from injuries or illness attributed to exposure to radiation released by the bombs.[1] In both cities, the overwhelming majority of the dead were civilians.[4][5]

Six days after the detonation over Nagasaki, on August 15, Japan announced its surrender to the Allied Powers, signing the Instrument of Surrender on September 2, officially ending the Pacific War and therefore World War II. (Germany had signed its Instrument of Surrender on May 7, ending the war in Europe.) The bombings led, in part, to post-war Japan adopting Three Non-Nuclear Principles, forbidding that nation from nuclear armament.[6]


The Manhattan Project

Main article: Manhattan Project

The United States, with assistance from the United Kingdom and Canada,[7] designed and built the first atomic bombs under what was called the Manhattan Project. The scientific research was directed by American physicist J. Robert Oppenheimer. The Hiroshima bomb, a gun-type bomb called "Little Boy", was made with uranium-235, a rare isotope of uranium. The atomic bomb was first tested at Trinity Site, on July 16, 1945, near Alamogordo, New Mexico. The test weapon, "the gadget," and the Nagasaki bomb, "Fat Man", were both implosion-type devices made primarily of plutonium-239, a synthetic element.[8]

Choice of targets


Map showing the locations of Hiroshima
and Nagasaki, Japan where the two
atomic weapons were employed

On May 10–11, 1945 The Target Committee at Los Alamos, led by J. Robert Oppenheimer , recommended Kyoto, Hiroshima, Yokohama, and the arsenal at Kokura as possible targets. The target selection was subject to the following criteria: (1) they are larger than three miles in diameter and are important targets in a large urban area (2) the blast would create effective damage, and (3) they are unlikely to be attacked by August 1945. "Any small and strictly military objective should be located in a much larger area subject to blast damage in order to avoid undue risks of the weapon being lost due to bad placing of the bomb." These cities were largely untouched during the nightly bombing raids and the Army Air Force agreed to leave them off the target list so accurate assessment of the weapon could be made. Hiroshima was described as "an important army depot and port of embarkation in the middle of an urban industrial area. It is a good radar target and it is such a size that a large part of the city could be extensively damaged. There are adjacent hills which are likely to produce a focussing effect which would considerably increase the blast damage. Due to rivers it is not a good incendiary target." The goal of the weapon was to convince Japan to surrender unconditionally in accordance with the terms of the Potsdam Declaration. The Target Committee stated that "It was agreed that psychological factors in the target selection were of great importance. Two aspects of this are (1) obtaining the greatest psychological effect against Japan and (2) making the initial use sufficiently spectacular for the importance of the weapon to be internationally recognized when publicity on it is released. In this respect Kyoto has the advantage of the people being more highly intelligent and hence better able to appreciate the significance of the weapon. Hiroshima has the advantage of being such a size and with possible focussing from nearby mountains that a large fraction of the city may be destroyed. The Emperor's palace in Tokyo has a greater fame than any other target but is of least strategic value."[9]

During World War II, Edwin O. Reischauer was the Japan expert for the US Army Intelligence Service, in which role he is incorrectly said to have prevented the bombing of Kyoto.[10] In his autobiography, Reischauer specifically refuted the validity of this broadly-accepted claim:

"...the only person deserving credit for saving Kyoto from destruction is Henry L. Stimson, the Secretary of War at the time, who had known and admired Kyoto ever since his honeymoon there several decades earlier."[11]

The Potsdam ultimatum

On July 26, Truman and other allied leaders issued The Potsdam Declaration outlining terms of surrender for Japan. It was presented as an ultimatum and stated that without a surrender, the Allies would attack Japan, resulting in "the inevitable and complete destruction of the Japanese armed forces and just as inevitably the utter devastation of the Japanese homeland" but the atomic bomb was not mentioned. On July 28, Japanese papers reported that the declaration had been rejected by the Japanese government. That afternoon, Prime Minister Kantaro Suzuki declared at a press conference that the Potsdam Declaration was no more than a rehash (yakinaoshi) of the Cairo Declaration and that the government intended to ignore it (mokusatsu).[12] The statement was taken by both Japanese and foreign papers as a clear rejection of the declaration. Emperor Hirohito, who was waiting for a Soviet reply to noncommittal Japanese peace feelers made no move to change the government position.[13] On July 31, he made clear to Kido that the Imperial Regalia of Japan had to be defended at all costs.[14]

In early July, on his way to Potsdam, Truman had re-examined the decision to use the bomb. In the end, Truman made the decision to drop the atomic bombs on Japan. His stated intention in ordering the bombings was to bring about a quick resolution of the war by inflicting destruction and instilling fear of further destruction in sufficient strength to cause Japan to surrender.[15]


Hiroshima during World War II

At the time of its bombing, Hiroshima was a city of some industrial and military significance. A number of military camps were located nearby, including the headquarters of the Fifth Division and Field Marshal Shunroku Hata's 2nd General Army Headquarters, which commanded the defense of all of southern Japan. Hiroshima was a minor supply and logistics base for the Japanese military. The city was a communications center, a storage point, and an assembly area for troops. It was one of several Japanese cities left deliberately untouched by American bombing, allowing a pristine environment to measure the damage caused by the atomic bomb.


A postwar "Little Boy" casing mockup

The center of the city contained several reinforced concrete buildings and lighter structures. Outside the center, the area was congested by a dense collection of small wooden workshops set among Japanese houses. A few larger industrial plants lay near the outskirts of the city. The houses were of wooden construction with tile roofs, and many of the industrial buildings also were of wood frame construction. The city as a whole was highly susceptible to fire damage.

The population of Hiroshima had reached a peak of over 381,000 earlier in the war, but prior to the atomic bombing the population had steadily decreased because of a systematic evacuation ordered by the Japanese government. At the time of the attack the population was approximately 255,000. This figure is based on the registered population used by the Japanese in computing ration quantities, and the estimates of additional workers and troops who were brought into the city may be inaccurate.

The bombing

For the composition of the USAAF mission see 509th Composite Group.



Seizo Yamada's ground level photo taken from
approximately 7 km northeast of Hiroshima.

Hiroshima was the primary target of the first nuclear bombing mission on August 6, with Kokura and Nagasaki being alternative targets. August 6 was chosen because there had previously been cloud cover over the target. The 393d Bombardment Squadron B-29 Enola Gay, piloted and commanded by 509th Composite Group commander Colonel Paul Tibbets, was launched from North Field airbase on Tinian in the West Pacific, about six hours flight time from Japan. The Enola Gay (named after Colonel Tibbets' mother) was accompanied by two other B29s, The Great Artiste which carried instrumentation, commanded by Major Charles W. Sweeney, and a then-nameless aircraft later called Necessary Evil (the photography aircraft) commanded by Captain George Marquardt.[16]

After leaving Tinian the aircraft made their way separately to Iwo Jima where they rendezvoused at 2,440 m (8,000 ft) and set course for Japan. The aircraft arrived over the target in clear visibility at 9,855 m (32,000 ft). On the journey, Navy Captain William Parsons had armed the bomb, which had been left unarmed to minimize the risks during takeoff. His assistant, 2nd Lt. Morris Jeppson, removed the safety devices thirty minutes before reaching the target area.[16]


Hiroshima, in the aftermath of the bombing

The release at 08:15 (Hiroshima time) was uneventful, and the gravity bomb known as "Little Boy", a gun-type fission weapon with 60 kg (130 pounds) of uranium-235, took fifty-seven seconds to fall from the aircraft to the predetermined detonation height about six hundred meters (1,900 ft) above the city. Due to crosswind, it missed the aiming point, the Aioi Bridge, by almost eight hundred feet and detonated directly over Shima Surgical Clinic.[17] It created a blast equivalent to about 13 kilotons of TNT. (The U-235 weapon was considered very inefficient, with only 1.38% of its material fissioning.)[18] The radius of total destruction was about one mile (1.6 km), with resulting fires across 11.4 km² (4.4 square miles).[19] Infrastructure damage was estimated at ninety percent of Hiroshima's buildings being either damaged or completely destroyed.

About an hour before the bombing, Japanese early warning radar detected the approach of some American aircraft headed for the southern part of Japan. An alert was given and radio broadcasting stopped in many cities, among them Hiroshima. At nearly 08:00, the radar operator in Hiroshima determined that the number of planes coming in was very small—probably not more than three—and the air raid alert was lifted. To conserve fuel and aircraft, the Japanese had decided not to intercept small formations. The normal radio broadcast warning was given to the people that it might be advisable to go to air-raid shelters if B-29s were actually sighted, but no raid was expected beyond some sort of reconnaissance.


The energy released by the bomb was powerful enough to burn through clothing. The dark portions of the garments this victim wore at the time of the blast were emblazoned on to the flesh as scars, while skin underneath the lighter parts (which absorb less energy) was not damaged as badly.[20]

Announcement of the bombing in audio

Truman announcing the bombing of Hiroshima

President Truman announces the bombing of Hiroshima.

Problems listening to the file? See media help.

Truman announcing the bombing of Hiroshima.

This is an extract from a radio report to the American people on the Potsdam Conference that was recorded at the White House by Columbia Broadcasting System on August 9, 1945. The original recording lasts about 20 minutes and is referenced under SR61-37 by the Harry S. Truman Library and Museum.

The full recording can be found online here. The full text of the adress can be found on the Harry S. Truman Library and Museum website.

The text of the extract itself is indicated below (original non included text in small)

Truman's words: "The British, Chinese, and United States Governments have given the Japanese people adequate warning of what is in store for them. We have laid down the general terms on which they can surrender. Our warning went unheeded; our terms were rejected. Since then the Japanese have seen what our atomic bomb can do. They can foresee what it will do in the future. The world will note that the first atomic bomb was dropped on Hiroshima, a military base. That was because we wished in this first attack to avoid, insofar as possible, the killing of civilians. But that attack is only a warning of things to come. If Japan does not surrender, bombs will have to be dropped on her war industries and, unfortunately, thousands of civilian lives will be lost. I urge Japanese civilians to leave industrial cities immediately, and save themselves from destruction. I realize the tragic significance of the atomic bomb. Its production and its use were not lightly undertaken by this Government. But we knew that our enemies were on the search for it. We know now how close they were to finding it. And we knew the disaster which would come to this Nation, and to all peace-loving nations, to all civilization, if they had found it first. That is why we felt compelled to undertake the long and uncertain and costly labor of discovery and production. We won the race of discovery against the Germans. Having found the bomb we have used it. We have used it against those who attacked us without warning at Pearl Harbor, against those who have starved and beaten and executed American prisoners of war, against those who have abandoned all pretense of obeying international laws of warfare. We have used it in order to shorten the agony of war, in order to save the lives of thousands and thousands of young Americans. We shall continue to use it until we completely destroy Japan's power to make war. Only a Japanese surrender will stop us."

Japanese realization of the bombing

The Tokyo control operator of the Japanese Broadcasting Corporation noticed that the Hiroshima station had gone off the air. He tried to re-establish his program by using another telephone line, but it too had failed.[21] About twenty minutes later the Tokyo railroad telegraph center realized that the main line telegraph had stopped working just north of Hiroshima. From some small railway stops within 16 kilometers (10 mi) of the city came unofficial and confused reports of a terrible explosion in Hiroshima. All these reports were transmitted to the headquarters of the Japanese General Staff.

Military bases repeatedly tried to call the Army Control Station in Hiroshima. The complete silence from that city puzzled the men at headquarters; they knew that no large enemy raid had occurred and that no sizeable store of explosives was in Hiroshima at that time. A young officer of the Japanese General Staff was instructed to fly immediately to Hiroshima, to land, survey the damage, and return to Tokyo with reliable information for the staff. It was generally felt at headquarters that nothing serious had taken place and that it was all a rumor.

The staff officer went to the airport and took off for the southwest. After flying for about three hours, while still nearly one hundred miles (160 km) from Hiroshima, he and his pilot saw a great cloud of smoke from the bomb. In the bright afternoon, the remains of Hiroshima were burning. Their plane soon reached the city, around which they circled in disbelief. A great scar on the land still burning and covered by a heavy cloud of smoke was all that was left. They landed south of the city, and the staff officer, after reporting to Tokyo, immediately began to organize relief measures.

Tokyo's first knowledge of what had really caused the disaster came from the White House public announcement in Washington, D.C., sixteen hours after the nuclear attack on Hiroshima.[22]

By August 8, 1945, newspapers in the US were reporting that broadcasts from Radio Tokyo had described the destruction observed in Hiroshima. "Practically all living things, human and animal, were literally seared to death," Japanese radio announcers said in a broadcast captured by Allied sources.[23]

Post-attack casualties

According to most estimates, the immediate effects of the blast of the bombing of Hiroshima killed approximately 70,000 people. Estimates of total deaths by the end of 1945 from burns, radiation and related disease, the effects of which were aggravated by lack of medical resources, range from 90,000 to 140,000.[3][24] Some estimates state up to 200,000 had died by 1950, due to cancer and other long-term effects.[1][25][4] From 1950 to 1990, roughly 9% of the cancer and leukemia deaths among bomb survivors was due to radiation from the bombs.[26] At least eleven known prisoners of war died from the bombing.[27]


Above shows a small-scale recreation of
the Nakajima area around ground zero.
There remains modern "Rest House"
(right) and a few structures.

Survival of some structures

Some of the reinforced concrete buildings in Hiroshima were very strongly constructed because of the earthquake danger in Japan, and their framework did not collapse even though they were fairly close to the center of damage in the city. Eizo Nomura (野村 英三, Nomura Eizō?) was the closest known survivor, who was in a basement of modern "Rest House" only 100 m from ground-zero at the time of the attack.[28] Akiko Takakura (高蔵 信子, Takakura Akiko?) was among the closest survivors to the hypocenter of the blast. She had been in the solidly built Bank of Hiroshima only 300 m from ground-zero at the time of the attack.[29] Since the bomb detonated in the air, the blast was more downward than sideways, which was largely responsible for the survival of the Prefectural Industrial Promotional Hall, now commonly known as the Genbaku, or A-bomb Dome designed and built by the Czech architect Jan Letzel, which was only 150 meters (490 ft) from ground zero (the hypocenter). The ruin was named Hiroshima Peace Memorial and was made a UNESCO World Heritage site in 1996 over the objections of the U.S. and China.[30]

Events of August 7-9

After the Hiroshima bombing, President Truman announced, "If they do not accept our terms, they may expect a rain of ruin from the air the likes of which has never been seen on this earth." On August 8, 1945, leaflets were dropped and warnings were given to Japan by Radio Saipan. The area of Nagasaki did not receive warning leaflets until August 10, though the leaflet campaign covering the whole country was over a month into its operations.[31][32]

The Japanese government still did not react to the Potsdam Declaration. Emperor Hirohito, the government and the War council were considering four conditions for surrender: the preservation of the kokutai (Imperial institution and national polity), assumption by the Imperial Headquarters of responsibility for disarmament and demobilization, no occupation, and delegation to the Japanese government of the punishment of war criminals.

The Soviet Foreign Minister Molotov informed Tokyo of the Soviet Union's unilateral abrogation of the Soviet-Japanese Neutrality Pact on April 5. At two minutes past midnight on August 9, Tokyo time, Soviet infantry, armor, and air forces had launched Manchurian Strategic Offensive Operation. Four hours later, word reached Tokyo that the Soviet Union had declared war on Japan. The senior leadership of the Japanese Army began preparations to impose martial law on the nation, with the support of Minister of War Korechika Anami, in order to stop anyone attempting to make peace.

Responsibility for the timing of the second bombing was delegated to Colonel Tibbets as commander of the 509th Composite Group on Tinian. Scheduled for August 11 against Kokura, the raid was moved forward to avoid a five day period of bad weather forecast to begin on August 10.[33] Three bomb pre-assemblies had been transported to Tinian, labeled F-31, F-32, and F-33 on their exteriors. On August 8 a dress rehearsal was conducted off Tinian by Maj. Charles Sweeney using Bockscar as the drop airplane. Assembly F-33 was expended testing the components and F-31 was designated for the mission August 9.[34]


Nagasaki during World War II


Urakami Tenshudo (Catholic Church in
Nagasaki) in January 1946, destroyed
by the atomic bomb, the dome of the
church having toppled off.

The city of Nagasaki had been one of the largest sea ports in southern Japan and was of great wartime importance because of its wide-ranging industrial activity, including the production of ordnance, ships, military equipment, and other war materials.

In contrast to many modern aspects of Hiroshima, the bulk of the residences were of old-fashioned Japanese construction, consisting of wood or wood-frame buildings, with wood walls (with or without plaster), and tile roofs. Many of the smaller industries and business establishments were also housed in buildings of wood or other materials not designed to withstand explosions. Nagasaki had been permitted to grow for many years without conforming to any definite city zoning plan; residences were erected adjacent to factory buildings and to each other almost as closely as possible throughout the entire industrial valley.

Nagasaki had never been subjected to large-scale bombing prior to the explosion of a nuclear weapon there. On August 1, 1945, however, a number of conventional high-explosive bombs were dropped on the city. A few hit in the shipyards and dock areas in the southwest portion of the city, several hit the Mitsubishi Steel and Arms Works and six bombs landed at the Nagasaki Medical School and Hospital, with three direct hits on buildings there. While the damage from these bombs was relatively small, it created considerable concern in Nagasaki and many people—principally school children—were evacuated to rural areas for safety, thus reducing the population in the city at the time of the nuclear attack.

To the north of Nagasaki there was a camp holding British Commonwealth prisoners of war, some of whom were working in the coal mines and only found out about the bombing when they came to the surface. At least eight known POWs died from the bombing. As many as thirteen POWs may have died in the Nagasaki bombing:

The bombing

For the composition of the USAAF mission see 509th Composite Group.



A post-war “Fat Man” model

On the morning of August 9, 1945, the U.S. B-29 Superfortress Bockscar, flown by the crew of 393rd Squadron commander Major Charles W. Sweeney, carried the nuclear bomb code-named "Fat Man", with Kokura as the primary target and Nagasaki the secondary target. The mission plan for the second attack was nearly identical to that of the Hiroshima mission, with two B-29's flying an hour ahead as weather scouts and two additional B-29's in Sweeney's flight for instrumentation and photographic support of the mission. Sweeney took off with his weapon already armed but with the electrical safety plugs still engaged.[43]



Illustration of the implosion concept employed in "Fat Man".

Observers aboard the weather planes reported both targets clear. When Sweeney's aircraft arrived at the assembly point for his flight off the coast of Japan, the third plane, Big Stink, flown by the group's Operations Officer, Lt. Col. James I. Hopkins,  Jr. failed to make the rendezvous. Bockscar and the instrumentation plane circled for forty minutes without locating Hopkins. Already thirty minutes behind schedule, Sweeney decided to fly on without Hopkins.[43]

By the time they reached Kokura a half hour later, a 7/10 cloud cover had obscured the city, prohibiting the visual attack required by orders. After three runs over the city, and with fuel running low because a transfer pump on a reserve tank had failed before take-off, they headed for their secondary target, Nagasaki.[43] Fuel consumption calculations made en route indicated that Bockscar had insufficient fuel to reach Iwo Jima and they would be forced to divert to Okinawa. After initially deciding that if Nagasaki were obscured on their arrival they would carry the bomb to Okinawa and dispose of it in the ocean if necessary, the weaponeer Navy Commander Frederick Ashworth decided that a radar approach would be used if the target was obscured.[44]



Nagasaki before and after bombing

At about 07:50 Japanese time, an air raid alert was sounded in Nagasaki, but the "all clear" signal was given at 08:30. When only two B-29 Superfortresses were sighted at 10:53, the Japanese apparently assumed that the planes were only on reconnaissance and no further alarm was given.

A few minutes later, at 11:00, The Great Artiste, the support B-29 flown by Captain Frederick C. Bock dropped instruments attached to three parachutes. These instruments also contained an unsigned letter to Professor Ryokichi Sagane, a nuclear physicist at the University of Tokyo who studied with three of the scientists responsible for the atomic bomb at the University of California, Berkeley, urging him to tell the public about the danger involved with these weapons of mass destruction. The messages were found by military authorities but not turned over to Sagane until a month later.[45] In 1949 one of the authors of the letter, Luis Alvarez, met with Sagane and signed the document.[46]

At 11:01, a last minute break in the clouds over Nagasaki allowed Bockscar's bombardier, Captain Kermit Beahan, to visually sight the target as ordered. The "Fat Man" weapon, containing a core of ~6.4 kg (14.1 lbs.) of plutonium-239, was dropped over the city's industrial valley. Forty-three seconds later it exploded 469 meters (1,540 ft) above the ground exactly halfway between the Mitsubishi Steel and Arms Works in the south and the Mitsubishi-Urakami Ordnance Works (Torpedo Works) in the north. This was nearly 3 kilometers (2 mi) northwest of the planned hypocenter; the blast was confined to the Urakami Valley and a major portion of the city was protected by the intervening hills.[47] The resulting explosion had a blast yield equivalent to 21 kilotons of TNT. The explosion generated heat estimated at 3,900 degrees Celsius (7,000 degrees Fahrenheit) and winds that were estimated at 1005 km/h (624 mph).



A Japanese report on the bombing
characterized Nagasaki as "like a graveyard
with not a tombstone standing".

Casualty estimates for immediate deaths range from 40,000 to 75,000.[48][49][50] Total deaths by the end of 1945 may have reached 80,000.[3] The radius of total destruction was about a mile (1.6 km), followed by fires across the northern portion of the city to two miles (3.2 km) south of the bomb.[51][52]

An unknown number of survivors from the Hiroshima bombing had made their way to Nagasaki, where they were bombed again.[53][54]

Plans for more atomic attacks on Japan

The United States expected to have another atomic bomb ready for use in the third week of August, with three more in September and a further three in October.[55] On August 10, Major General Leslie Groves, military director of the Manhattan Project, sent a memorandum to General of the Army George Marshall, Chief of Staff of the United States Army, in which he wrote that "the next bomb . . should be ready for delivery on the first suitable weather after 17 or August 18." On the same day, Marshall endorsed the memo with the comment, "It is not to be released over Japan without express authority from the President."[55] There was already discussion in the War Department about conserving the bombs in production until Operation Downfall, the projected invasion of Japan, had begun. "The problem now [August 13th] is whether or not, assuming the Japanese do not capitulate, to continue dropping them every time one is made and shipped out there or whether to hold them . . . and then pour them all on in a reasonably short time. Not all in one day, but over a short period. And that also takes into consideration the target that we are after. In other words, should we not concentrate on targets that will be of the greatest assistance to an invasion rather than industry, morale, psychology, and the like? Nearer the tactical use rather than other use."[55]

The surrender of Japan and subsequent occupation

Main articles: Surrender of Japan and Occupation of Japan

Up to August 9, the war council was still insisting on its four conditions for surrender. On that day Hirohito ordered Kido to "quickly control the situation" "because Soviet Union has declared war against us". He then held an Imperial conference during which he authorized minister Togo to notify the Allies that Japan would accept their terms on one condition, that the declaration "does not compromise any demand which prejudices the prerogatives of His Majesty as a Sovereign ruler". [56]

On August 12, the Emperor informed the imperial family of his decision to surrender. One of his uncles, Prince Asaka, then asked whether the war would be continued if the kokutai could not be preserved. Hirohito simply replied "of course".[57] As the Allied terms seemed to leave intact the principle of the preservation of the Throne, Hirohito recorded on August 14 his capitulation announcement which was broadcast to the Japanese nation the next day despite a short rebellion by militarists opposed to the surrender.

(Kyūjitai: 國體, Shinjitai: 国体, lit. "national body/structure") is a politically loaded word in the Japanese language, translatable as "national identity; national essence; national character" or "national polity; body politic; national entity; basis for the Emperor's sovereignty; Japanese constitution". Historian John S. Brownlee gives this characterization.

The most original political idea ever developed in Japan was that of the Kokutai [National Essence]. It served from the Meiji Restoration to 1945 as an inspiring and unifying ideology, and provided the national political framework within which to place the system of constitutional monarchy borrowed from the West under the Meiji Constitution of 1889. It solves many of the puzzles of understanding that Constitution. However, unlike the idea of democracy which has universal appeal, the idea of the Kokutai was useful only in Japan, and contributed nothing whatever to the development of political ideas anywhere else in the world, even when imperial Japan tried to export it to subject countries. In addition, its fundamental irrationalism is appalling and offensive to many, though this is a characteristic shared by many other political systems based on religious ideas. (2000:1)

Most simple translation may be sovereign. For example, in United Kingdom, House of Common, House of Lords and Monarchy combined to form a sovereign, while in pre war Japan, Emperor alone formed a sovereign.

In his declaration, Hirohito referred to the atomic bombings :

Moreover, the enemy now possesses a new and terrible weapon with the power to destroy many innocent lives and do incalculable damage. Should we continue to fight, not only would it result in an ultimate collapse and obliteration of the Japanese nation, but also it would lead to the total extinction of human civilization.

“Such being the case, how are We to save the millions of Our subjects, or to atone Ourselves before the hallowed spirits of Our Imperial Ancestors? This is the reason why We have ordered the acceptance of the provisions of the Joint Declaration of the Powers.”

In his "Rescript to the soldiers and sailors" delivered on August 17, he stressed the impact of the Soviet invasion and his decision to surrender, omitting any mention of the bombs.

During the year after the bombing, approximately 40,000 U.S. occupation troops were in Hiroshima. Nagasaki was occupied by 27,000 troops.

Atomic Bomb Casualty Commission

In the spring of 1948, the Atomic Bomb Casualty Commission (ABCC) was established in accordance with a presidential directive from Harry S. Truman to the National Academy of Sciences-National Research Council to conduct investigations of the late effects of radiation among the survivors in Hiroshima and Nagasaki. Among the casualties were found many unintended victims including:

One of the early studies conducted by the ABCC was on the outcome of pregnancies occurring in Hiroshima and Nagasaki, and in a control city, Kure located 18 miles (29 km) south from Hiroshima, to discern the conditions and outcomes related to radiation exposure. Some would say ABCC was not in a position to offer medical treatment to the survivors except in a research capacity. One author has claimed that the ABCC refused to provide medical treatment to the survivors for better research results.[59] In 1975, the Radiation Effects Research Foundation was created to assume the responsibilities of ABCC.

The Hibakusha

Panoramic view of the monument marking the hypocentre, or
ground zero, of the atomic bomb explosion over Nagasaki.



Citizens of Hiroshima walk by the
Hiroshima Peace Memorial, the
closest building to have survived
the city's atomic bombing.

The surviving victims of the bombings are called Hibakusha (被爆者, Hibakusha?), a Japanese word that literally translates to "explosion-affected people". The suffering of the bombing has led Japan to seek the abolition of nuclear weapons from the world ever since, exhibiting one of the world's most firm non-nuclear policies. As of March 31, 2008, there were 243,692 hibakusha recognized by the Japanese government; most live in Japan.[60] The government of Japan recognizes about 1% of these as having illnesses caused by radiation.[61] The memorials in Hiroshima and Nagasaki contain lists of the names of the hibakusha who are known to have died since the bombings. Updated annually on the anniversaries of the bombings, as of August 2008 the memorials record the names of more than 400,000 hibakusha — 258,310[62] in Hiroshima, and 145,984[63] in Nagasaki.

Korean survivors

During the war Japan brought many Korean conscripts to both Hiroshima and Nagasaki to work as forced labor. According to recent estimates, about 20,000 Koreans were killed in Hiroshima and about 2,000 died in Nagasaki. It is estimated that one in seven of the Hiroshima victims was of Korean ancestry.[5] For many years, Koreans had a difficult time fighting for recognition as atomic bomb victims and were denied health benefits. However, most issues have been addressed in recent years through lawsuits.[64]

Debate over bombings

Main article: Debate over the atomic bombings of Hiroshima and Nagasaki

Those who argue in favor of the decision to drop the bombs generally assert that they caused the Japanese surrender, preventing massive casualties on both sides in the planned invasion of Japan.

Those who argue against the decision to drop the bombs characterize them as inherently immoral, war crimes or, crimes against humanity and/or state terrorism. They may also argue that they were militarily unnecessary.

See also


Wikimedia Commons has media related to:

Atomic bombings of Hiroshima and Nagasaki


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  2. ^ Hakim, Joy (1995). A History of Us: War, Peace and all that Jazz. New York: Oxford University Press. ISBN 0-19-509514-6. 
  3. ^ a b c "Frequently Asked Questions #1". Radiation Effects Research Foundation. Retrieved on 2007-09-18.
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  8. ^ Gosling, F.G. (January 1999). "The Manhattan Project: Making the Atomic Bomb" (PDF). United States Department of Energy. Retrieved on 2007-12-04.
  9. ^ "Atomic Bomb: Decision — Target Committee, May 10–11, 1945". Retrieved on August 6, 2005.
  10. ^ A-bomb targets/decision-making record (1945)
  11. ^ Reischauer, Edwin. (1986). My Life Between Japan And America, p. 101.
  12. ^ Frank, Richard B.. Downfall, 233–234.  The meaning of the word mokusatsu can fall anywhere in the range of "ignore" to "treat with contempt".
  13. ^ Bix, Herbert (1996). "Japan's Delayed Surrender: A Reinterpretation", in Michael J. Hogan, ed.: Hiroshima in History and Memory. Cambridge University Press, 290. ISBN 0-521-56682-7. 
  14. ^ Kido Koichi nikki, Tokyo, Daigaku Shuppankai, 1966, p.1120-1121
  15. ^ Allen, Thomas; Norman Polmar (1995). Code-Name Downfall. New York, NY: Simon & Schuster, 266-270. ISBN 0684804069. 
  16. ^ a b "Timeline #2- the 509th; The Hiroshima Mission". Children of the Manhattan Project. Retrieved on July 26, 2006.
  17. ^ Enola Gay, ISBN 0-671-81499-0-250, page 309
  18. ^ "The Bomb-"Little Boy"". The Atomic Heritage Foundation. Retrieved on May 5, 2007.
  20. ^ Radiation Event Medical Management. Thermal Skin Burns: Example after Nuclear Blast
  21. ^ "No High Ground by Knebel et al p175 to p201" (PDF). Retrieved on April 30, 2007.
  22. ^ "White House Press Release on Hiroshima". Retrieved on June 5, 2006. The press release, it should be noted, was written not by Truman but primarily by William L. Laurence, a New York Times reporter allowed access to the Manhattan Project.
  23. ^ "Fulton Sun Retrospective". Retrieved on July 8, 2007.
  24. ^ "Chapter II: The Effects of the Atomic Bombings". United States Strategic Bombing Survey. Originally by U.S. G.P.O.; stored on (1946). Retrieved on 2007-09-18.
  25. ^ Another review and analysis of the various death toll estimates is in: Richard B. Frank (2001). Downfall: The End of the Imperial Japanese Empire. Penguin Publishing. ISBN 0-679-41424-X. 
  26. ^ [1]Radiation Effects Research Foundation FAQ
  27. ^ David Rubin, 2005, "Remembering Normand Brissette" (Downloaded 28/10/06)
  28. ^ A Short-Sighted Parrot
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  31. ^ "Studies in Intelligence". Retrieved on August 6, 2005.
  32. ^ "American Experience". Retrieved on August 6, 2005.
  33. ^ Martin J. Sherwin (2003). A World Destroyed: Hiroshima and its Legacies, 2nd edition, Stanford University Press, 233-234. 
  34. ^ Richard H. Campbell (2005). "Chapter 2: Development and Production", The Silverplate Bombers: A History and Registry of the Enola Gay and Other B-29s Configured to Carry Atomic Bombs. McFarland & Company, Inc., p.114. ISBN 0-7864-2139-8. 
  35. ^ [2]
  36. ^ [3] This reference also lists at least three other POWS who died on 9-8-1945
  37. ^ [4]
  38. ^ [5]
  39. ^ [6] does not tell if these were Nagasaki casualties
  40. ^ [7]
  41. ^ [8]
  42. ^ [ United States Merchant website
  43. ^ a b c "Timeline #3- the 509th; The Nagasaki Mission". The Atomic Heritage Foundation. Retrieved on May 5, 2007.
  44. ^ "Spitzer Personal Diary Page 25 (CGP-ASPI-025)". The Atomic Heritage Foundation. Retrieved on May 5, 2007.
  45. ^ Lillian Hoddeson, et al, Critical Assembly: A Technical History of Los Alamos During the Oppenheimer Years, 1943-1945 (New York: Cambridge University Press, 1993), on 295.
  46. ^ "Stories from Riken" (PDF).
  47. ^ Dennis D. Wainstock (1996). The Decision to Drop the Atomic Bomb. Praeger, 92. 
  48. ^ Rinjiro Sodei. Were We the Enemy?: American Survivors of Hiroshima. Boulder: Westview Press, 1998, ix.
  49. ^ Rezelman, David; F.G. Gosling and Terrence R. Fehner (2000). "THE ATOMIC BOMBING OF NAGASAKI". The Manhattan Project: An Interactive History. U.S. Department of Energy. Retrieved on 2007-09-18.
  50. ^ ""Nagasaki's Mayor Slams U.S. for Nuke Arsenal"". Associated Press (2005-08-09). Retrieved on 2007-09-18.
  51. ^ "Radiation Dose Reconstruction; U.S. Occupation Forces in Hiroshima and Nagasaki, Japan, 1945-1946 (DNA 5512F)" (PDF). Retrieved on June 9, 2006.
  52. ^ "Nagasaki marks tragic anniversary". People's Daily (2005-08-10). Retrieved on April 14, 2007.
  53. ^ "'I saw both of the bombs and lived'". The Observer (reported in The Guardian) (2005-07-24). Retrieved on April 14, 2007.
  54. ^ Trumbull, Robert (1957). Nine Who Survived Hiroshima and Nagasaki. Tokyo, Japan: Tuttle Publishing. 
  55. ^ a b c "The Atomic Bomb and the End of World War II, A Collection of Primary Sources," (pdf). National Security Archive Electronic Briefing Book No. 162. The George Washington University (1945-08-13).
  56. ^ Kido Koichi nikki,Tokyo, Daigaku Shuppankai, 1966, p.1223
  57. ^ Terasaki Hidenari, Shōwa tennō dokuhakuroku, 1991, p.129
  58. ^ Forgotten Wars: Freedom and Revolution in Southeast Aisa, Prologue:An Unending War, Christopher Bayly & Tim Harper, The Belknap Press of Harvard University Press, pp. 3 ISBN 0674021533
  59. ^ M. Susan Lindee (1994). Suffering Made Real: American Science and the Survivors at Hiroshima. University Of Chicago Press. ISBN 0226482375. 
  60. ^ ""Hiroshima mayor hopes next U.S. president will back ban on nuclear weapons"". Japan Today (2008-08-06). Retrieved on 2008-08-09.
  61. ^ ""Relief for A-bomb victims" (editorial)". The Japan Times (2007-08-15). Retrieved on 2007-10-02.
  62. ^ ""Hiroshima marks 63rd anniversary of A-bomb"". Asahi Shimbun (2008-08-07). Retrieved on 2008-08-09.
  63. ^ ""Thousands remember atomic bombing of Nagasaki on 63rd anniversary"". Mainichi Daily News (2008-08-10). Retrieved on 2008-08-09.
  64. ^ Hibakusha: A Korean's fight to end discrimination toward foreign A-bomb victims, Mainichi Daily News. May 9, 2008.

Further reading


The black marker indicates "ground zero"
of the Nagasaki atomic bomb explosion.

There is an extensive body of literature concerning the bombings, the decision to use the bombs, and the surrender of Japan. The following sources provide a sampling of prominent works on this subject matter.

External links