Little Boy

The Hiroshima firestorm was roughly {{convert|2.0|mi|km|order=flip}} in diameter, corresponding closely to the severe blast damage zone. (See the USSBS{{sfn |D’Olier|1946|pp=22–25}} map, right.) Blast-damaged buildings provided fuel for the fire. Structural lumber and furniture were splintered and scattered about. Debris-choked roads obstructed firefighters. Broken gas pipes fueled the fire, and broken water pipes rendered hydrants useless.{{sfn|Glasstone|Dolan|1977|pages=300–304}} At Nagasaki, the fires failed to merge into a single firestorm, and the fire-damaged area was only one fourth as great as at Hiroshima, due in part to a southwest wind that pushed the fires away from the city.{{sfn|Glasstone|Dolan|1977|page=304}}

The Hiroshima firestorm was roughly {{convert|2.0|mi|km|order=flip}} in diameter, corresponding closely to the severe blast damage zone. (See the USSBS{{sfn |D’Olier|1946|pp=22–25}} map, right.) Blast-damaged buildings provided fuel for the fire. Structural lumber and furniture were splintered and scattered about. Debris-choked roads obstructed firefighters. Broken gas pipes fueled the fire, and broken water pipes rendered hydrants useless.{{sfn|Glasstone|Dolan|1977|pages=300–304}} At Nagasaki, the fires failed to merge into a single firestorm, and the fire-damaged area was only one fourth as great as at Hiroshima, due in part to a southwest wind that pushed the fires away from the city.{{sfn|Glasstone|Dolan|1977|page=304}}

As the map shows, the Hiroshima firestorm jumped natural firebreaks (river channels), as well as prepared firebreaks. The spread of fire stopped only when it reached the edge of the blast-damaged area, encountering less available fuel.{{sfn|The Atomic Bombings of Hiroshima and Nagasaki, 1946|pages=21–23}}

As the map shows, the Hiroshima firestorm jumped natural firebreaks (river channels), as well as prepared firebreaks. The spread of fire stopped only when it reached the edge of the blast-damaged area, encountering less available fuel.{{sfn|The Atomic Bombings of Hiroshima and Nagasaki, 1946|pages=21–23}} The Manhattan Project report on Hiroshima estimated that 60% of immediate deaths were caused by fire, but with the caveat that “many persons near the center of explosion suffered fatal injuries from more than one of the bomb effects.”{{sfn|The Atomic Bombings of Hiroshima and Nagasaki, 1946|page=21}}

Accurate casualty figures are impossible to deter{{shy}}mine, because many personal records of existence were cremated by the firestorm along with the victims they pertained to. The Manhattan Project report on Hiroshima estimated that 60% of immediate deaths were caused by fire, but with the caveat that “many persons near the center of explosion suffered fatal injuries from more than one of the bomb effects.”{{sfn|The Atomic Bombings of Hiroshima and Nagasaki, 1946|page=21}} In particular, many fire victims also received lethal doses of nuclear radiation.

===Radiation===

===Radiation===