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I remembered the line from the Hindu scripture, the Bhagavad-Gita… ‘Now, I am become Death, the destroyer of worlds.” Robert Oppenheimer speaking about the first nuclear weapons test on 16 July 1945

71 years later, today, people are still dying as a result of the delayed effect of radiation. Atomic bomb hospitals are full of those people“. (Setsuko Thurlow, May 27, 2016, DemocracyNow interview)

From US office of scientific and technical info web site:
THE ATOMIC BOMBING OF HIROSHIMA
(Hiroshima, Japan, August 6, 1945)

In the early morning hours of August 6, 1945, a B-29 bomber named Enola Gay took off from the island of Tinian and headed north by northwest toward Japan.  The bomber’s primary target was the city of Hiroshima, located on the deltas of southwestern Honshu Island facing the Inland Sea.  Hiroshima had a civilian population of almost 300,000 and was an important military center, containing about 43,000 soldiers.

The bomber, piloted by the commander of the 509th Composite Group, Colonel Paul Tibbets, flew at low altitude on automatic pilot before climbing to 31,000 feet as it neared the target area.  At approximately 8:15 a.m. Hiroshima time the Enola Gay released “Little Boy,” its 9,700-pound uranium gun-type bomb, over the city.  Tibbets immediately dove away to avoid the anticipated shock wave.  Forty-three seconds later, a huge explosion lit the morning sky as Little Boy detonated 1,900 feet above the city, directly over a parade field where soldiers of the Japanese Second Army were doing calisthenics.  Though already eleven and a half miles away, the Enola Gay was rocked by the blast.  At first, Tibbets thought he was taking flak. 

After a second shock wave (reflected from the ground) hit the plane, the crew looked back at Hiroshima.  “The city was hidden by that awful cloud . . . boiling up, mushrooming, terrible and incredibly tall,” Tibbets recalled.  The yield of the explosion was later estimated at 15 kilotons (the equivalent of 15,000 tons of TNT).

On the ground moments before the blast it was a calm and sunny Monday morning.  An air raid alert from earlier that morning had been called off after only a solitary aircraft was seen (the weather plane), and by 8:15 the city was alive with activity — soldiers doing their morning calisthenics, commuters on foot or on bicycles, groups of women and children working outside to clear firebreaks.  Those closest to the explosion died instantly, their bodies turned to black char.  Nearby birds burst into flames in mid-air, and dry, combustible materials such as paper instantly ignited as far away as 6,400 feet from ground zero.  The white light acted as a giant flashbulb, burning the dark patterns of clothing onto skin (right) and the shadows of bodies onto walls.  Survivors outdoors close to the blast generally describe a literally blinding light combined with a sudden and overwhelming wave of heat. (The effects of radiation are usually not immediately apparent.)  The blast wave followed almost instantly for those close-in, often knocking them from their feet.  Those that were indoors were usually spared the flash burns, but flying glass from broken windows filled most rooms, and all but the very strongest structures collapsed.  One boy was blown through the windows of his house and across the street as the house collapsed behind him.  Within minutes 9 out of 10 people half a mile or less from ground zero were dead.
Hiroshima fabric pattern on back
People farther from the point of detonation experienced first the flash and heat, followed seconds later by a deafening boom and the blast wave.  Nearly every structure within one mile of ground zero was destroyed, and almost every building within three miles was damaged.  Less than 10 percent of the buildings in the city survived without any damage, and the blast wave shattered glass in suburbs twelve miles away.  The most common first reaction of those that were indoors even miles from ground zero was that their building had just suffered a direct hit by a bomb. 
Hiroshima rubble peace dome

Small ad hoc rescue parties soon began to operate, but roughly half of the city’s population was dead or injured.  In those areas most seriously affected virtually no one escaped serious injury.  The numerous small fires that erupted simultaneously all around the city soon merged into one large firestorm, creating extremely strong winds that blew towards the center of the fire.  The firestorm eventually engulfed 4.4 square miles of the city, killing anyone who had not escaped in the first minutes after the attack.  One postwar study of the victims of Hiroshima found that less than 4.5 percent of survivors suffered leg fractures.  Such injuries were not uncommon; it was just that most who could not walk were engulfed by the firestorm.

Even after the flames had subsided, relief from the outside was slow in coming.  For hours after the attack the Japanese government did not even know for sure what had happened.  Radio and telegraph communications with Hiroshima had suddenly ended at 8:16 a.m., and vague reports of some sort of large explosion had begun to filter in, but the Japanese high command knew that no large-scale air raid had taken place over the city and that there were no large stores of explosives there.  Eventually a Japanese staff officer was dispatched by plane to survey the city from overhead, and while he was still nearly 100 miles away from the city he began to report on a huge cloud of smoke that hung over it.  The first confirmation of exactly what had happened came only sixteen hours later with the announcement of the bombing by the United States.

Relief workers from outside the city eventually began to arrive and the situation stabilized somewhat.  Power in undamaged areas of the city was even restored on August 7th, with limited rail service resuming the following day.  Several days after the blast, however, medical staff began to recognize the first symptoms of radiation sickness among the survivors.  Soon the death rate actually began to climb again as patients who had appeared to be recovering began suffering from this strange new illness.  Deaths from radiation sickness did not peak until three to four weeks after the attacks and did not taper off until seven to eight weeks after the attack.  Long-range health dangers associated with radiation exposure, such as an increased danger of cancer, would linger for the rest of the victims’ lives, as would the psychological effects of the attack.

No one will ever know for certain how many died as a result of the attack on Hiroshima.  Some 70,000 people probably died as a result of initial blast, heat, and radiation effects.  This included about twenty American airmen being held as prisoners in the city.  By the end of 1945, because of the lingering effects of radioactive fallout and other after effects, the Hiroshima death toll was probably over 100,000.  The five-year death total may have reached or even exceeded 200,000, as cancer and other long-term effects took hold.
Hiroshima Makeshift Hospital OSTI gov
At 11:00 a.m., August 6 (Washington D.C. time), radio stations began playing a prepared statement from President Truman informing the American public that the United States had dropped an entirely new type of bomb on the Japanese city of Hiroshima — an “atomic bomb.” Truman warned that if Japan still refused to surrender unconditionally, as demanded by the Potsdam Declaration of July 26, the United States would attack additional targets with equally devastating results.  Two days later, on August 8, the Soviet Union declared war on Japan and attacked Japanese forces in Manchuria, ending American hopes that the war would end before Russian entry into the Pacific theater.  By August 9th, American aircraft August 9th, American aircraft were showering leaflets all over Japan informing its people that “We are in possession of the most destructive explosive ever devised by man.  A single one of our newly developed atomic bombs is actually the equivalent in explosive power to what 2,000 of our giant B-29s can carry on a single mission.  This awful fact is one for you to ponder and we solemnly assure you it is grimly accurate.  We have just begun to use this weapon against your homeland.  If you still have any doubt, make inquiry as to what happened to Hiroshima when just one atomic bomb fell on that city.”  Meanwhile, Tibbets’s bomber group was simply waiting for the weather to clear in order to drop its next bomb, the plutonium implosion weapon nicknamed “Fat Man” (left) that was destined for the city of Nagasaki
“. https://www.osti.gov/opennet/manhattan-project-history/Events/1945/hiroshima.htm (More pictures at link, OSTI, Part of the US DOE)

More excerpts from the Democracy Now interview:
SETSUKO THURLOW: No, unfortunately, people are still denying, and they are living—sleepwalking, I would say. They know a little bit, but they don’t want to face it. They push it in the corner of their brain and pretend as though nothing is going to happen to them. But we do have close to 16,000 nuclear weapons. Each one of it is much more destructive than the little one dropped over my head. Sixteen thousand of them, owned by nine—five nuclear weapon states recognized by the U.N., and four additional nations… And Mr. Obama just recently declared that he was planning to spend $1 trillion to update a weapons system, I mean, to modernize nuclear weapons and delivery system, $1 trillion…

SETSUKO THURLOW: Well, my school built a hut in the mountain, and the school invited us back. We were so happy to find who survived. Well, you know, many girls showed up wearing the bonnet or scarves, because they were bald, bald-headed. And I lost my hair, too, not completely like other girls. I was inside the building. Maybe that helped. But I, too, lost hair, bleeding from the gum, internal bleeding and diarrhea and all these kind of common symptom everybody shared in the city.

Let me talk about my favorite uncle and aunt. We heard that they were OK, they survived, they were alive, and they didn’t have any external evidence of injury. But a week later, their bodies started showing purple spots all over the place. And there was a rumor: If you have that purple spot, that was a sure sign you’re going to die. So, in those days, the first thing we did in the morning, before we got dressed, was to check every part of our body to make sure we didn’t find. That was the kind of anxiety we lived with. Anyway, my parents looked after this sick uncle and aunt. And according to my mother, their bodies, my uncle’s and aunt’s bodies, seemed to be their internal—their internal—what is the word? The stuff inside the body.
JUAN GONZÁLEZ: The organs.
SETSUKO THURLOW: Yeah, that seemed to be rotten and dissolving and coming out as thick black liquid. So, my mother had to use any old material or old newspaper to use as the diapers, well, until their deaths, that everything came out from their body just in a thick black fluid.

Radiation seemed to have affected people in many different ways and many different times. Somebody died immediately, and some a week later, month later, a year later. And, you know, that famous little girl who folded the paper cranes, I think she died 10 years later. The fact is, 71 years later, today, people are still dying as a result of the delayed effect of radiation. Atomic bomb hospitals are full of those people. So, the effect has been continuing on and on. And so, every time I go to Japan, I go to the atomic bomb hospital, I get a close checkup. I am grateful for that. And I am kept OK on a medication“. Excerpted from “I Want the World to Wake Up”: Hiroshima Survivor Criticizes Obama for Pushing New Nuclear Weapons“, May 27, 2016, on DemocracyNow. org. See entire interview here: https://miningawareness.wordpress.com/2016/08/07/i-want-the-world-to-wake-up-hiroshima-survivor-criticizes-obama-for-pushing-new-nuclear-weapons/

https://en.wikiquote.org/wiki/Robert_Oppenheimer

The Medical Implications of Nuclear War
Fred Solomon and Robert Q. Marston, Editors; with a foreword by Lewis Thomas; Steering Committee for the Symposium on the Medical Implications of Nuclear War, Institute of Medicine, 1986, National Academies Press
http://www.ncbi.nlm.nih.gov/books/NBK219165/ (Estimated US casualties, etc.)