From the A-Bomb Museum:
Hiroshima after affects
Chaotic conditions made accurate accounts most difficult. Some victims were vaporized instantly, many survivors were horribly disfigured, and death from radiation was uncertainit might not claim its victims for days, weeks, months, or even years.
The initial death count in Hiroshima, set at 42,00093,000, was based solely on the disposal of bodies, and was thus much too low. Later surveys covered body counts, missing persons, and neighborhood surveys during the first months after the bombing, yielding a more reliable estimate of 130,000 dead as of November 1945. A similar survey by officials in Nagasaki set its death toll at 60,00070,000. (Its plutonium bomb was more powerful, but its destructive range was limited by surrounding hills and mountains).
Additional counts indicated high levels of short-term mortality in both cities:
Over 90% of persons within 500 meters (1,600 ft.) of ground zero in both cities died.
At 1.5 km (almost one mile), over 2/3 were casualties, and 1/3 died.
Of those at a distance of 2 km (1.2 mi.), half were casualties, 10% of whom died.
Casualties dropped to 10% at distances over 4 km (2.4 mi.).
Most persons close to ground zero who received high radiation dosages died immediately or during the first day. One-third of all fatalities occurred by the 4th day; two-thirds by the 10th day; and 90% by the end of three weeks.
While casualty rates exceeded death rates, they both were highest near ground zero and declined at similar rates by increasing distance from ground zero. But the cumulative death rates (%) in both cities rose dramatically during the first two weeks, then leveled off in subsequent weeks.
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*Figure 11. Relation of casualty (0---0) and mortality (*---*) rates to distance from ground zero. (Impact, p. 86. Fig, 11)
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*Figure 12. Cumulative death rate of atomic bomb victims. (Impact, p. 86. Fig. 12)
Injury Phases
A.First two weeks: mainly burns from rays and flames, and wounds (trauma) from blast and falling structures.
B. 3rd week through 8th week: symptoms of damages by radioactive rays, e.g., loss of hair, anemia, loss of white cells, bleeding, diarrhea. Approximately 10% of cases in this group were fatal.
C. 3rd and 4th months: some improvement in burn, trauma, and even radiation
injuries. But then came secondary injuries of disfiguration, severe scar formations (keloids), blood abnormalities, sterility (both sexes), and psychosomatic disorders.
D. Even now, after over half a century later, many aftereffects remain: leukemia,
A-bomb cataracts, and cancers of thyroid, breast, lungs, salivary glands, birth defects, including mental retardation, and fears of birth defects in their children, plus, of course, the disfiguring keloid scars.
