Nomura Kiyoshi, Yunoki Akira, Hara Masayuki, Morito Yuko, Fujishima Akira
Tokyo University of Science, Kagurazaka 1-3, Shinjuku-ku 162-8601, Japan.
National Institute of Advanced Industrial Science and Technology (AIST)/National Metrological Institute of Japan, Umesono 1-1-1, Tsukuba, Ibaraki 305-8568, Japan.
Appl Radiat Isot. 2018 Sep;139:12-19. doi: 10.1016/j.apradiso.2018.04.018. Epub 2018 Apr 10.
A flexible γ detector using a liquid scintillation light guide (LSLG) was developed. The analyzed pulse height (PHA) spectrum depended on the diameter, length and scintillator concentration of the LSLG, and the distance of a γ ray irradiation point from the head of photomultiplier tube (PMT). From the analysis of PHA spectrum, it was found that the count ratio of two divided channel regions linearly decreases as the distance from the PMT head increases. It was further found that the radiation dose rate can be estimated by setting the flexible LSLG tube to a circular shape since the count rate is proportional to the dose rate measured by a conventional NaI (Tl) scintillation detector. Therefore, a flexible and long LSLG detector using a single PMT is useful for determination of the dose rate and has a potential to detect local contaminations in a certain narrow space.
开发了一种使用液体闪烁光导（LSLG）的柔性γ探测器。分析的脉冲高度（PHA）谱取决于LSLG的直径、长度和闪烁体浓度，以及γ射线照射点到光电倍增管（PMT）头部的距离。通过对PHA谱的分析发现，随着距PMT头部距离的增加，两个划分通道区域的计数比呈线性下降。还进一步发现，由于计数率与传统碘化钠（铊）闪烁探测器测量的剂量率成正比，因此将柔性LSLG管设置为圆形可估计辐射剂量率。因此，使用单个PMT的柔性长LSLG探测器可用于剂量率的测定，并且有潜力检测特定狭窄空间中的局部污染。
