铀矿样氡射气系数γ能谱法的应用及可靠性分析  

A gamma spectroscopy method for measuring radon emanation coefficient of uranium sample and its reliability analysis

作　　者：居治豪 周青芝[1] 徐乐昌[2] 肖德涛[1] 张辉[2] 丘寿康[1] 

机构地区：[1]南华大学核科学技术学院,湖南衡阳421001 [2]核工业北京化工冶金研究院,北京101149

出　　处：《铀矿冶》2016年第3期224-228,共5页Uranium Mining and Metallurgy

基　　金：环境保护部核设施安全监管司核与辐射安全监管项目(调查1606)

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.

关 键 词：Γ能谱法 氡射气系数 可靠性 

分 类 号：TL81[核科学技术—核技术及应用]