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海水中放射性铯快速测量方法研究
Study on Fast Measurement of Radioactive Cesium in Seawater

DOI: 10.12677/AMS.2016.33010, PP. 65-72

Keywords: 海水,放射性铯,快速测量
Seawater
, Radioactive Cesium, Fast Measurement

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Abstract:

海水中放射性铯的活度浓度必须通过吸附浓缩后才可以测量,缩短吸附浓缩技术的时间是提高采样时空分辨率的关键因素。课题组于2014年7月和11月对厦门近岸水体进行调查,分别利用实验室沉淀法和现场快速富集法分别对所调查海域水样中的放射性Cs-137进行测量,并针对体积对结果误差及方法探测限的影响进行研究。结果表明,两种方法得到的结果在同一数量级水平,2014年7月航次二者的一致率为66.7%,2014年11月航次二者的一致率为46.7%。体积在1000 L以内时,数据结果的误差和方法探测限均随体积增大而明显减小,综合考虑,现场快速富集法中过滤海水体积应不小于1000 L。
The activity concentration of radioactive cesium in seawater must be measured by adsorption concentration, and the time to shorten the concentration of adsorption is the key factor to improve the spatial and temporal resolution of sampling. Research group surveyed the coastal waters of Xiamen in July and November 2014, using the precipitation method and the on-site rapid enrichment method respectively for the measurement of radioactive Cs-137 in sea water samples, and aimed at the volume, the results error and method detection limits were investigated. The results show that the results obtained by the two methods were at the same magnitude level, the consistent rate being 66.7% in the July 2014 voyage and 46.7% in November 2014. When the volume is less than 1000 L, the error of the data and the detection limit of the method are obviously decreased with the increase of the volume, so that the volume of filtered seawater should not be less than 1000 L using the on-site rapid enrichment method.

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