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Title: Measurements of the absolute neutron fluence spectrum emitted at 0/sup 0/ and 90/sup 0/ from the Little-Boy replica

Abstract

Nuclear research emulsions (NRE) have been used to characterize the neutron spectrum emitted by the Little-Boy replica. NRE were irradiated at the Little-Boy surface as well as approximately 2m from the center of the Little-Boy replica using polar angles of 0/sup 0/, 30/sup 0/, 60/sup 0/ and 90/sup 0/. For the NRE exposed at 2m, neutron background was determined using shadow shields of borated polyethylene. Emulsion scanning to date has concentrated exclusively on the 2m, 0/sup 0/ and 2m, 90/sup 0/ locations. Approximately 5000 proton-recoil tracks have been measured in NRE irradiated at each of these locations. At the 2m, 90/sup 0/ location the NRE neutron spectrum extends from 0.37 up to 8.2 MeV, whereas the NRE neutron spectrum at the 2m, 0/sup 0/ location is much softer and extends only up to 2.7 MeV. NRE neutron spectrometry results at these two locations are compared with both liquid scintillator neutron spectrometry and Monte Carlo calculations. 7 refs., 3 figs.

Authors:
; ;
Publication Date:
Research Org.:
Hanford Engineering Development Lab., Richland, WA (USA)
OSTI Identifier:
6042240
Report Number(s):
HEDL-SA-3325-FP; CONF-850933-4
ON: DE86006490
DOE Contract Number:  
AC06-76FF02170
Resource Type:
Conference
Resource Relation:
Conference: 13. international conference on solid state nuclear track detectors, Rome, Italy, 23 Sep 1985
Country of Publication:
United States
Language:
English
Subject:
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; LITTLE BOY; NEUTRON SPECTRA; NUCLEAR EMULSIONS; PHOTOGRAPHIC FILM DETECTORS; MEASURING INSTRUMENTS; NUCLEAR WEAPONS; RADIATION DETECTORS; SPECTRA; WEAPONS; 450202* - Explosions & Explosives- Nuclear- Weaponry- (-1989); 654003 - Radiation & Shielding Physics- Neutron Interactions with Matter

Citation Formats

Roberts, J H, Gold, R, and Preston, C C. Measurements of the absolute neutron fluence spectrum emitted at 0/sup 0/ and 90/sup 0/ from the Little-Boy replica. United States: N. p., 1985. Web.
Roberts, J H, Gold, R, & Preston, C C. Measurements of the absolute neutron fluence spectrum emitted at 0/sup 0/ and 90/sup 0/ from the Little-Boy replica. United States.
Roberts, J H, Gold, R, and Preston, C C. 1985. "Measurements of the absolute neutron fluence spectrum emitted at 0/sup 0/ and 90/sup 0/ from the Little-Boy replica". United States.
@article{osti_6042240,
title = {Measurements of the absolute neutron fluence spectrum emitted at 0/sup 0/ and 90/sup 0/ from the Little-Boy replica},
author = {Roberts, J H and Gold, R and Preston, C C},
abstractNote = {Nuclear research emulsions (NRE) have been used to characterize the neutron spectrum emitted by the Little-Boy replica. NRE were irradiated at the Little-Boy surface as well as approximately 2m from the center of the Little-Boy replica using polar angles of 0/sup 0/, 30/sup 0/, 60/sup 0/ and 90/sup 0/. For the NRE exposed at 2m, neutron background was determined using shadow shields of borated polyethylene. Emulsion scanning to date has concentrated exclusively on the 2m, 0/sup 0/ and 2m, 90/sup 0/ locations. Approximately 5000 proton-recoil tracks have been measured in NRE irradiated at each of these locations. At the 2m, 90/sup 0/ location the NRE neutron spectrum extends from 0.37 up to 8.2 MeV, whereas the NRE neutron spectrum at the 2m, 0/sup 0/ location is much softer and extends only up to 2.7 MeV. NRE neutron spectrometry results at these two locations are compared with both liquid scintillator neutron spectrometry and Monte Carlo calculations. 7 refs., 3 figs.},
doi = {},
url = {https://www.osti.gov/biblio/6042240}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 1985},
month = {Tue Jan 01 00:00:00 EST 1985}
}

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