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Title: Yields of the Hiroshima and Nagasaki nuclear explosions

Abstract

A. deterministic estimate of the nuclear radiation fields from the Hiroshima and Nagasaki nuclear weapon explosions requires the yields of these explosions. The yield of the Nagasaki explosion is rather well established by both fireball and radiochemical data from other tests as 21 kt. There are no equivalent data for the Hiroshima explosion. Equating thermal radiation and blast effects observed at the two cities subsequent to the explosions gives a yield of about 15 kt. The pressure-vs-time data, obtained by dropped, parachute-retarded canisters and reevaluated using 2-D hydrodynamic calculations, give a yield between 16 and 17 kt. Scaling the gamma-ray dose data and calculations gives a yield of about 15 kt. Sulfur neutron activation data give a yield of about 15 kt. The current best estimates for the yield of these explosions are the following: Hiroshima 15 kt Nagasaki 21 kt The outside limits of uncertainties in these values are believed to be 20 percent for Hiroshima and 10 percent for Nagasaki.

Authors:
 [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1489669
Report Number(s):
LA-8819
DOE Contract Number:  
AC52-06NA25396
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE; FISSION YIELD; NUCLEAR EXPLOSIONS; HISTORICAL SUMMARY; BLAST EFFECTS; GRAPHS; RADIATION DOSES; DATA

Citation Formats

Malik, John. Yields of the Hiroshima and Nagasaki nuclear explosions. United States: N. p., 1985. Web. doi:10.2172/1489669.
Malik, John. Yields of the Hiroshima and Nagasaki nuclear explosions. United States. https://doi.org/10.2172/1489669
Malik, John. 1985. "Yields of the Hiroshima and Nagasaki nuclear explosions". United States. https://doi.org/10.2172/1489669. https://www.osti.gov/servlets/purl/1489669.
@article{osti_1489669,
title = {Yields of the Hiroshima and Nagasaki nuclear explosions},
author = {Malik, John},
abstractNote = {A. deterministic estimate of the nuclear radiation fields from the Hiroshima and Nagasaki nuclear weapon explosions requires the yields of these explosions. The yield of the Nagasaki explosion is rather well established by both fireball and radiochemical data from other tests as 21 kt. There are no equivalent data for the Hiroshima explosion. Equating thermal radiation and blast effects observed at the two cities subsequent to the explosions gives a yield of about 15 kt. The pressure-vs-time data, obtained by dropped, parachute-retarded canisters and reevaluated using 2-D hydrodynamic calculations, give a yield between 16 and 17 kt. Scaling the gamma-ray dose data and calculations gives a yield of about 15 kt. Sulfur neutron activation data give a yield of about 15 kt. The current best estimates for the yield of these explosions are the following: Hiroshima 15 kt Nagasaki 21 kt The outside limits of uncertainties in these values are believed to be 20 percent for Hiroshima and 10 percent for Nagasaki.},
doi = {10.2172/1489669},
url = {https://www.osti.gov/biblio/1489669}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1985},
month = {9}
}