放射性131I是核事故早期重点监测和关注的典型核素之一。介绍一种船用移动式131I监测仪的研制。采用井型活性炭滤盒采集样品，内置NaI探测器实时监测131I核素的364 keV特征峰。触摸液晶屏上显示131I的活度浓度测量结果，当浓度超过报警阈值时可发出声光报警信号。设备重约40 kg，底部安装有脚轮，便于移动式携行，可用于舰船集防区内及核事故后环境中放射性核素131I的识别和活度浓度测量，对于判定舰船集防效果和提升核事故应急监测的能力具有重要意义。
Iodine-131 is one of the typical nuclides that needs to focus on and monitor in the early stage of nuclear accidents. Design and manufacture of a ship-borne portable Iodine-131 monitor is presented here. 131I was collected by the well-type active carbon filter, and its characteristic peak with gamma-ray energy 364 keV was detected by NaI detector. Activity concentration of 131I was displayed on the touch screen, and once the limit threshold is exceeded it can send out sound and light alarm signals. It weighs about 40 kg and has two castors in the bottom, as is convenient for portable carrying and use. This portable Iodine-131 monitor can be used to detect whether radioiodine exists inside the collective protection region of surface ship and surrounding environment of the nuclear accident region, which has important significant to evaluate the protective efficacy of the collective protection region and enhance the capacity of nuclear emergency monitoring.
2019,41(1): 138-140 收稿日期：2018-01-27
DOI：10.3404/j.issn.1672-7649.2019.01.027
分类号：TP816+.2;TL817+.2
作者简介：闫学昆(1981-),男,博士,工程师,研究方向为辐射防护与环境保护
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