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Appl Radiat Isot. 2008 Apr;66(4):457-62. Epub 2007 Oct 30.

On the optimization of the isotopic neutron source method for measuring the thermal neutron absorption cross section: advantages and disadvantages of BF3 and 3He counters.

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1
Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Mickiewicza 30, 30-59 Kraków, Poland.

Abstract

The effect of the detector characteristics on the performance of an isotopic neutron source device for measuring thermal neutron absorption cross section (Sigma) has been examined by means of Monte Carlo simulations. Three specific experimental arrangements, alternately with BF(3) counters and (3)He counters of the same sizes, have been modelled using the MCNP-4C code. Results of Monte Carlo calculations show that devices with BF(3) counters are more sensitive to Sigma, but high-pressure (3)He counters offer faster assays.

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