期刊论文

中文

原子能科学技术

1000-6931

2017

51

3

515-521

10.7538/yzk.2017.51.03.0515

湖南省自然科学基金资助项目（2016JJ2106）；

本校为第一机构

随着放射源和放射装置的广泛应用,放射源事故的发生概率不断增大。因此,一旦发现放射源丢失,如何尽快将其定位并安全找回尤为重要。本文设计了一种三角圆筒铅屏蔽的NaI探测器,用于放射源的定位探测。实验研究了测量时间、铅屏蔽厚度、源与探测器间距、伽马射线能量等因素对放射源定位的影响。结果表明:对于源,在空气吸收剂量率≥0.028 μGy/h处,定位平均角度偏差≤1.24°;对于~(60)Co源,在空气吸收剂量率0.4 μGy/h处,测量的平均角度偏差为1.16°;对于距离约1.5 m的9.25×10~5 Bq ~(137)Cs源,定位偏差约为0.097 m。

With the wide spread applications of radioactive sources and radiation devices, the probability of radiation accidents caused by sources becomes larger. Therefore, how to locate and safely find those radioactive sources, which had been lost is quite important. In this paper, a triangular cylindrical lead shield NaI detector was designed to locate the radioactive source. In the experiment, the influences of the measuring time, the thickness of the lead shield, the distance between the radioactive source and the detector, and the energy of the gamma ray on the location accuracy of the radioactiv...