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