Tichý Miloš, Huml Ondřej
Department of Nuclear Reactors, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University, V Holešovičkách 747/2, 180 00, Prague 8, Czech Republic.
Appl Radiat Isot. 2022 Jun;184:110193. doi: 10.1016/j.apradiso.2022.110193. Epub 2022 Mar 12.
Five types of scintillators for parallel detection of neutrons and γ were tested for their pulse shape discrimination ability. All detectors are based on Li (n,alpha)H reaction. LiI, ZnS and polystyrene were used as scintillators. Tests were performed at different neutron and γ mixed fields (AmBe, Cf) using a small Hamamatsu photomultiplier and a Picoscope digitizer. A polystyrene-based ZnS + LiF detector was proven to be the most suitable for neutron-γ separation and similar sensitivity for both types of radiation to construct a single device to measure integral quantities neutrons and γ (fluence, ambient dose equivalent) in parallel. The ZnS + LiF detector based on plexiglass, is in principle useable also, but has low sensitivity to γ radiation. The tested Li glass or LiI crystal does not have the ability to separate neutron and γ. With amplitude discrimination it can be used as a neutron detector for a much simpler probe for a Bonner spectrometer.
对用于中子和γ平行探测的五种闪烁体的脉冲形状甄别能力进行了测试。所有探测器均基于锂（n，α）氢反应。碘化锂、硫化锌和聚苯乙烯用作闪烁体。使用小型滨松光电倍增管和皮克示波器数字化仪，在不同的中子和γ混合场（镅铍、锎）下进行了测试。结果表明，基于聚苯乙烯的硫化锌+氟化锂探测器最适合中子-γ分离，并且对两种辐射具有相似的灵敏度，可构建单个装置来并行测量中子和γ的积分量（注量、环境剂量当量）。基于有机玻璃的硫化锌+氟化锂探测器原则上也可用，但对γ辐射的灵敏度较低。所测试的锂玻璃或碘化锂晶体不具备分离中子和γ的能力。通过幅度甄别，它可用作中子探测器，用于邦纳谱仪的更简单探头。
