生物样品中氚的前处理装置的设计  

A pre-treatment device designed for tritium analysis in biological samples

作　　者：薛秀家[1] 张友九[1] 

机构地区：[1]苏州大学医学部放射医学与公共卫生学院江苏省放射医学与防护重点实验室,215123

出　　处：《中华放射医学与防护杂志》2011年第4期478-481,共4页Chinese Journal of Radiological Medicine and Protection

摘　　要：目的为监测生物样品中氚，设计一套前处理装置，并进行性能评估。方法使用标准氚水拟合探测效率的标准曲线。利用高、中、低3种不同活度标准氚水和^1H-TdR，分别测定自由水氚和有机氚的前处理化学回收率，并对3种生物样品中氚进行比对测量。结果拟合的标准曲线可以用于环境中氚放射性测量，氚的仪器探测效率为23．3％。该装置在处理加标样的40．0g的大米样品时，对标准氚水和^1H—TdR平均化学回收率为95．4％，重复性较好。本单位和江苏省辐射环境监测管理站的生物样品比对测量结果分别为小麦1．74和1．80Bq／kg，紫菜3．44和2．50Bq／kg，茶叶3．28和5．50Bq／kg，比对结果接近。结论设计的前处理装置可以用于环境生物样品中有机氚的测量。Objective To design a new pre-treatment device and to evaluate its efficiency in order to monitor the tritium levels in biological samples. Methods The detection efficiency of tritium was determined with standard tritiated water. Recovery of tritiated water and organically bound tritium （OBT） were detected with high, medium and low activities of standard tritiated water and 3H-TdR （tritiated thymidine） , respectively. Comparison of three kinds of biological samples using different pre-treatment devices was shown. Results The standard curve can be used in environmental tritium measurement and the detection efficiency for tritium was 23.3%. When 40. 0 g rice with standard HTO or 3H-TdR was pre- treated with this device, the average recovery of HTO and OBT was about 95.4% , which showed good reproducibility. The comparison results were similar. Conclusions The pre-treatment device can be used to survey the OBT in environmental biological samples.

关 键 词：生物样品 有机氚 燃烧 液体闪烁计数 

分 类 号：R115[医药卫生—公共卫生与预防医学]