Abstract
An improved experimental approach has been developed to determine thermal neutron absorption cross sections. It uses an 124Sb–Be neutron source which has an average neutron energy of only about 12 keV. It can be moderated in either a water tank or a paraffin filled box and can be used for aqueous or powder samples. This new design is first optimized by MCNP simulation and then benchmarked and calibrated with experiments to verify the simulations and realize the predicted improved measurement sensitivity and reproducibility. The 124Sb–Be source device is from 1.35 to 1.71 times more sensitive than the previous method based on the use of a 252Cf source.
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