Absolute Thermal Neutron Determination Part III: Absolute Thermal Neutron Flux
- Univ. of California, Los Angeles, CA (United States)
- North American Aviation, Inc., Canoga Park, CA (United States). Atomics International Div.
A method for determining absolute thermal neutron flux is described. The method is based on a determination of the absolute specific disintegration rate in indium foils in a windowless proportional counter with 2π geometry. By combining data on the absolute disintegration rate of activated indium foils with appropriate corrections for neutron effects, the thermal flux is expressed in terms of σ0, the known thermal absorption cross section of In115. The method presented has an estimated error of less than 5 per cent, which is a function of the accuracy with which it is possible to determine the various f factors for beta counting. However, it does not include a possible fixed error in the value of σ0. The procedure described may be used by laboratories which do not have access to a standard graphite pile or to a standard neutron source.
- Research Organization:
- North American Aviation, Inc., Canoga Park, CA (United States). Atomics International Div.
- Sponsoring Organization:
- US Atomic Energy Commission (AEC)
- DOE Contract Number:
- AT(11-1)-GEN-8
- NSA Number:
- NSA-12-001504
- OSTI ID:
- 4349196
- Report Number(s):
- NAA-SR--1137(Pt.III)
- Country of Publication:
- United States
- Language:
- English
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