Absolute Thermal Neutron Determination Part III: Absolute Thermal Neutron Flux
TL;DRAbstract
A method for determining absolute thermal neutron flux is described. The method is based on a determination of the absolute specific disintegration rate in In foils in a windowless proportional counter with 2 pi geometry. By combining data on the absolute disintegration rate of activated In foils with appropriate corrections for neutron effects, the thermal flux is expressed in terms of sigma /sub o/, the known thermal absorption cross section of In/sup 115/ . The method presented has an estimated error of less than 5% 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 sigma /sub o/. The procedure described may be used by laboratories which do not have access to a standard graphite pile or to a standard neutron source. (auth)
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A method for determining absolute thermal neutron flux is described. The method is based on a determination of the absolute specific disintegration rate in In foils in a windowless proportional counter with 2 pi geometry. By combining data on the absolute disintegration rate of activated In foils with appropriate corrections for neutron effects, the thermal flux is expressed in terms of sigma /sub o/, the known thermal absorption cross section of In/sup 115/ . The method presented has an estimated error of less than 5% 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 sigma /sub o/. The procedure described may be used by laboratories which do not have access to a standard graphite pile or to a standard neutron source. (auth)
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