Estimates of Casualties

Hiroshima Nagasaki
Pre-raid population 255,000 195,000
Dead 66,000 39,000
Injured 69,000 25,000
Total Casualties 135,000 64,000

The relation of total casualties to distance from X, the center of damage
and point directly under the air-burst explosion of the bomb, is of great
importance in evaluating the casualty-producing effect of the bombs. This
relationship for the total population of Nagasaki is shown in the table
below, based on the first-obtained casualty figures of the District:

TABLE B
Relation of Total Casualties to Distance from X

Distance Total Killed per
from X, feet Killed Injured Missing Casualties square mile
0 - 1,640 7,505 960 1,127 9,592 24,7OO
1,640 - 3,300 3,688 1,478 1,799 6,965 4,040
3,300 - 4,900 8,678 17,137 3,597 29,412 5,710
4,900 - 6,550 221 11,958 28 12,207 125
6,550 - 9,850 112 9,460 17 9,589 20

No figure for total pre-raid population at these different distances were
available. Such figures would be necessary in order to compute per cent
mortality. A calculation made by the British Mission to Japan and based on
a preliminary analysis of the study of the Joint Medical-Atomic Bomb
Investigating Commission gives the following calculated values for per cent