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Influence of scattered neutron radiation on instruments' calibration
M D Pyshkina1, A V Vasilyev1, A A Ekidin1
1Institute of Industrial Ecology of Ural Branch of the Russian Academy of Sciences, Russian Federation.
None:
Results of study of stationary neutron field of calibration installation UKPN-1M in normal operating conditions are presented. The influence of reflecting and absorbing surfaces, assembling materials, equipment, and toolings on spectrum moderation of neutron energies is shown. In separate points of the UKPN-1M room, the share of thermal neutrons in the energy spectrum increases by 7.5 times and the share of intermediate-energy neutrons increases by a factor of two. For the given space local areas, the contribution to the neutron ambient dose equivalent (H∗(10)) increases from 0.3% to 3.7% and to the neutrons of the intermediate energies from 5.9% to 18.1% in comparison with those space areas without moderation effect of the neutron energy spectrum of surrounding materials. The effect of neutron flux moderation leads to overestimation of measuring results of neutron radiation H∗(10) in comparison with the calculated value of H∗(10) by the energy spectrum by 3.77, 1.54, and 1.25 times for DKS-96 with BDKN-96, DKS-96 with BDMN-96, and AT1117M with BDKN-06 respectively.
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