Multilayer Passive Shielding of Scintillation Detectors Based on BGO, NaI(Tl), and Stilbene Crystals Operating in Intense Neutron Fields with an Energy of 14.1 MeV

摘要

We discuss the issues related to choosing the optimum type of passive shielding of scintillation detectors based on BGO, Nal(Tl), and stilbene crystals from the direct penetration of neutron radiation with an energy of 14.1 MeV that was emitted isotropically into a solid angle of 4π. A series of experimental measurements of the count-rate suppression factor that may be obtained for the indicated detectors through the use of various shielding filters comprising iron, lead, and borated polyethylene layers with a total thickness not exceeding 50 cm are conducted.