A New Method for Fast Neutron Dosimetry with a Circulating Liqujd
نویسنده
چکیده
A new approach to fast-neutron dosimeq is described. It involves circulating a liquid with dissolved chemicals between a localized neutron field and a remote area where neutron-induced radioactivities are measured continuously. This approach employs reactions whch generate relatively short-lived radioactive byproducts. Sensitivity to the neutron energy spectrum is achieved by choosing several reactions with differing thresholds. Neutron field strengths and their time variations can be derived from experimental data using the known radioactive-decay properties, cross sections, detector efficiencies, liquid flow rates and composition of the liquid. The concept has been demonstrated by measurements which utilized an aqueous solution of yttrium chloride hexahydrate , a 14-MeV neutron generator and Ge gamma-ray detectors. The 160(n.p)'6N, 37Cl(n,p)37S and 89Y(n,n')*A"Y activation reactions served as dosimeters.
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