Neutron self-shielding correction for prompt gamma neutron activation analysis of large samples |
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| Authors: | M Blaauw T Belgya |
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| Institution: | (1) Interfaculty Reactor Institute, Mekelweg 15, 2629 JB Delft, The Netherlands;(2) Department of Nuclear Research, Institute of Isotopes and Surface Chemistry, Chemical Research Centre of the HAS, P.O. Box 77, H-1525 Budapest, Hungary |
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| Abstract: | Summary Facilities and methods for INAA of large samples (up to 30 kg) have been developed and successfully tested at IRI, Delft. The methods encompass corrections for neutron self shielding in an isotropic neutron field and gamma self-absorption. The sample’s neutron absorption and scattering characteristics are determined by monitoring the neutron fluence rate around the sample and comparing the neutron densities measured with unperturbed fluence rates. We report on the possibility of developing similar methods for PGNAA. Relative self-shielding factors were measured as well as obtained from Monte Carlo computations. The agreement is good except for the most extreme case, with respect to absorption, attempted (CCl4). |
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