Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

Nuclear research emulsion neutron spectrometry at the Little-Boy replica

Technical Report ·
OSTI ID:6334062
; ;
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 2 m 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 2 m, neutron background was determined using shadow shields of borated polyethylene. Emulsion scanning to date has concentrated exclusively on the 2-m, 0/sup 0/ and 2-m, 90/sup 0/ locations. Approximately 5000 proton-recoil tracks have been measured in NRE irradiated at each of these locations. Neutron spectra obtained from these NRE proton-recoil spectra are compared with both liquid scintillator neutron spectrometry and Monte Carlo calculations. NRE and liquid scintillator neutron spectra generally agree within experimental uncertainties at the 2-m, 90/sup 0/ location. However, at the 2-m, 0/sup 0/ location, the neutron spectra derived from these two independent experimental methods differ significantly. NRE spectra and Monte Carlo calculations exhibit general agreement with regard to both intensity as well as energy dependence. Better agreement is attained between theory and experiment at the 2-m, 90/sup 0/ location, where the neutron intensity is considerably higher. 14 refs., 18 figs., 11 tabs.
Research Organization:
Hanford Engineering Development Lab., Richland, WA (USA)
DOE Contract Number:
AC06-76FF02170
OSTI ID:
6334062
Report Number(s):
HEDL-7559; ON: DE86003267
Country of Publication:
United States
Language:
English

Similar Records

Measurements of the absolute neutron fluence spectrum emitted at 0/sup 0/ and 90/sup 0/ from the Little-Boy replica
Conference · Mon Dec 31 23:00:00 EST 1984 · OSTI ID:6042240
Little Boy neutron spectrum below 3 MeV
Conference · Sat Dec 31 23:00:00 EST 1983 · OSTI ID:6809066
Gamma-ray spectra and doses from the Little Boy replica
Conference · Sat Dec 31 23:00:00 EST 1983 · OSTI ID:6813828

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
220600 -- Nuclear Reactor Technology-- Research
Test & Experimental Reactors
654003* -- Radiation & Shielding Physics-- Neutron Interactions with Matter
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
DATA
DISTRIBUTION
EXPERIMENTAL DATA
INFORMATION
LITTLE BOY
MEASURING INSTRUMENTS
NEUTRON DETECTORS
NEUTRON SPECTRA
NUCLEAR WEAPONS
NUMERICAL DATA
PROTON RECOIL DETECTORS
RADIATION DETECTORS
REACTORS
RESEARCH AND TEST REACTORS
RESEARCH REACTORS
SPECTRA
WEAPONS