Flexible alpha camera for detecting plutonium contamination
Flexible alpha camera for detecting plutonium contamination
复制标题
DOI：
10.1016/j.radmeas.2017.04.009
复制
发表时间：
2017-08-01
影响因子：
2
通讯作者：
Nemoto, Norio
中科院分区：
文献类型：
--
作者：
Morishita, Yuki;Yamamoto, Seiichi;Nemoto, Norio
我们开发了一种名为柔性阿尔法相机的新型成像探测器，可以识别工作场所狭窄空间中的钚污染。柔性α相机的厚度仅相当于通常用于检测钚污染的硫化锌(Ag)闪烁探测器的1/5，对于5.5 MeV的α粒子，其4pi方向的效率为42.7%。在30分钟内测得的最小可检测活度为0.014 Bq。用柔性α相机测量了四种类型的PuO2样品，这些样品取自管道、袋进/袋出口、手套和乙烯基膜。在阿尔法粒子的二维分布中，PuO2是使用ImageJ插件中的“AnalyzeParticle”函数自动识别的，并评估了其活性。当采集时间从10min增加到30min时，发现了一个活性较低的Pu点。为了验证在狭窄空间中的测量，使用柔性阿尔法相机测量了附着了PuO2颗粒的通风柜。由于柔性α相机的厚度为12 mm，可以获得α粒子的二维分布和能谱，因此对于设备狭小空间中的钚污染检测是有效的。(C)2017爱思唯尔有限公司。保留所有权利。
We developed a new imaging detector called flexible alpha camera that can identify Pu contamination in narrow spaces at work sites. The thickness of the flexible alpha camera is only similar to 1/5th that of the ZnS(Ag) scintillation detector which is commonly used for detecting Pu contamination, and its efficiency in the 4 pi direction is 42.7% for 5.5-MeV alpha particles. The minimal detectable activity (MDA) is 0.014 Bq measured in 30 min. Four types of PuO2 samples, taken from a duct, bag-in/bag-out port, glovebox glove, and vinyl sheet, were measured by the flexible alpha camera. In a two-dimensional distribution of alpha particles, PuO2 was identified automatically using the "AnalyzeParticle" function in the ImageJ plugin, and its activity was evaluated. When acquisition time increased from 10 min to 30 min, a Pu spot with low activity was identified. To verify the measurement in narrow space, a fume hood to which a PuO2 particle was attached was measured using the flexible alpha camera. Since the flexible alpha camera has the thin-thickness of 12 mm and can obtain two-dimensional distribution and energy spectrum of alpha particles, it is effective for detecting Pu contamination in narrow spaces of equipment. (C) 2017 Elsevier Ltd. All rights reserved.