铀矿样氡射气系数γ能谱法的应用及可靠性分析
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摘要
采用γ能谱法对我国北方某铀矿样氡射气系数进行测量,并对该方法的可靠性进行分析。基于同类矿石平行样测量结果的分析,发现γ能谱法对同类样品的测量结果一致性较好。同一个样品不同氡累积时间所测结果的重复性较好,表明在所采用的样品密封时间内,矿样中的自由氡和束缚氡已达到平衡状态。基于单一特征核素特征峰净计数以及各核素总净计数2种方式均可准确计算得到氡射气系数,并将基于2种方式求得的氡射气系数标准不确定度进行比较,发现采用特征核素总γ净计数的测量结果稳定性更好。通过对γ能谱法进行应用和可靠性分析,为γ能谱法测量氡射气系数的推广及基于此方法的后续研究提供参考。
Radon emanation coefficient is an important parameter for evaluating of radiation of uranium mine.The radon emanation coefficient of uranium ore in northern China was measured by HPGeγspectrometer and the reliability by this method was analyzed too.The measurement results of parallel samples have good repeatability.Also,the measurement results of the same samples with different radon accumulating time have good consistency which shows that the sample seal time by this method is enough to balance free radon and bound radon.The radon emanation coefficient can be computed by measuring difference characteristic nuclides,however that results based on total gamma ray have smaller standard uncertainty than that of the average value based on the single characteristic nuclide.Therefore,the measurement result by characteristic nuclide totalγnet count numbers is more reliable.By this study ofγspectroscopy method to measure radon emanation coefficient and analyze reliability can generalizeγspectroscopy method to measure radon emanation coefficient development and application,also provide reference experience to the follow-up study.
Radon emanation coefficient is an important parameter for evaluating of radiation of uranium mine.The radon emanation coefficient of uranium ore in northern China was measured by HPGeγspectrometer and the reliability by this method was analyzed too.The measurement results of parallel samples have good repeatability.Also,the measurement results of the same samples with different radon accumulating time have good consistency which shows that the sample seal time by this method is enough to balance free radon and bound radon.The radon emanation coefficient can be computed by measuring difference characteristic nuclides,however that results based on total gamma ray have smaller standard uncertainty than that of the average value based on the single characteristic nuclide.Therefore,the measurement result by characteristic nuclide totalγnet count numbers is more reliable.By this study ofγspectroscopy method to measure radon emanation coefficient and analyze reliability can generalizeγspectroscopy method to measure radon emanation coefficient development and application,also provide reference experience to the follow-up study.
引文
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[7]邓君.建筑材料致居民辐射剂量模型及氡射气系数快速测量方法研究[D].北京:中国疾病预防控制中心,2014:41-44.
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[2]中国核工业总公司地质总局.铀矿射气系数测定规范:EJ/T 1030—1996[S].北京:中国核工业总公司,1996:1-10.
[3]Austin S R,Droullard R F.Radon emanation from domestic uranium ores determined by modifications of the closed-can gamma-only assay method[R].[S.l.][s.n.]:Report of investigation,1977.
[4]王涛.块状矿样射气系数测定的γ法[R].湖南:核工业部第六研究所,1983:1-12.
[5]吴慧山,于铭强.关于射气测量的问题[J].国外放射性地质,1976(1):34-46.
[6]肖拥军,肖德涛,陈凌.煤样射气系数的测定及其影响因素的探讨[J].核电子与探测技术.2010,30(2):229-232.
[7]邓君.建筑材料致居民辐射剂量模型及氡射气系数快速测量方法研究[D].北京:中国疾病预防控制中心,2014:41-44.
[8]丘寿康.射气系数的含义和测定-一些值得注意和研究的问题:中国核学会矿山辐射环境学术讨论会[C].北京:中国核学会铀矿冶学会,1981:1-11.