杨亚新^1,,
罗齐彬²,
张叶³,
吴信民²,
郑勇明⁴,
邓居智²
1. 东华理工大学核资源与环境教育部重点实验室, 南昌 330013
2. 东华理工大学地球物理与测控技术学院, 南昌 330013
3. 东华理工大学核科学与工程学院, 南昌 330013
4. 东华理工大学信息工程学院, 南昌 330013

基金项目: 国家自然科学基金项目（41574102，41774134）、国家重点研发计划（2017YFC0602604）和东华理工大学研究生创新项目（YC2017-B081）联合资助


详细信息

作者简介: 杨亚新, 女, 1963年生, 江苏金坛人, 教授, 主要从事铀资源勘查和辐射环境监测与评价研究.E-mail:yxyang@ecit.cn

中图分类号: P631

收稿日期:2017-09-04
修回日期:2018-09-05
上线日期:2018-11-05

Study on influence factors of the α-track measuring method for uranium prospecting

YANG YaXin^1,,
LUO QiBin²,
ZHANG Ye³,
WU XinMin²,
ZHENG YongMing⁴,
DENG JuZhi²
1. East China University of Technology, Key Laboratory of Nuclear Resources and Environment, Ministry of Education, Nanchang 330013, China
2. East China University of Technology, School of Geophysics and Measurement-control Technology, Nanchang 330013, China
3. East China University of Technology, School of Nuclear Science and Engineering, Nanchang 330013, China
4. East China University of Technology, School of Information Engineering, Nanchang 330013, China


MSC: P631

--> Received Date: 04 September 2017
Revised Date: 05 September 2018
Available Online: 05 November 2018


摘要
摘要:我国于1974年开始将核径迹探测技术应用于铀矿勘探，其中α径迹测量是寻找深部隐伏铀矿的有效方法之一.本文对氡浓度大小、探杯尺寸、杯内表面放射性沉积物以及杯内底面固体放射性元素等对α径迹测量结果的影响进行了理论研究，建立了α径迹测量中不同装置结构及不同放射性元素对α径迹密度影响的理论公式，为该方法应用于铀矿勘探以及环境氡浓度测量提供理论参考依据.同时结合实验对比测量，进一步对理论公式进行验证，α径迹测量结果与理论计算所得结果吻合较好.研究结果表明：探测器上α径迹主要来源于氡，探杯尺寸不应小于氡致α径迹的最大有效探测尺寸.此外，放射性沉积物放出的α射线对测量结果有重要积极贡献，在铀矿勘探中，从提高探测灵敏度和减小测量结果不确定度的角度来看，其影响越大越好.在大多数测量装置尺寸下，探杯内底面以下的固态α放射性元素对径迹密度影响较小或无影响，实际测量时可将其忽略.
关键词: α径迹测量/
铀矿/
氡/
探杯尺寸/
放射性沉积物/
固态α放射性元素

Abstract:Nuclear track detection technology was applied to prospect domestic uranium in 1974, of which α-track measuring is one of the effective methods used for prospecting concealed uranium deposits. This paper presents a theoretical study on the influence factors of α-track measuring including radon concentration, size of measuring-cup, superficial α-radioactive sediments and solid α-radioelements inside the cup. A few theoretical equations between results of α-track measuring and different structures of measuring-cup as well as different radioelements are established, which would be very useful for applying α-track measuring to uranium prospecting and environmental radon measurement. Comparison with experimental results further validate these theoretical equations. Results show that α-tracks inside the detector are mainly caused by radon, which result in that the size of measuring-cup cannot be smaller than the effective size of detection of α-tracks caused by radon. On the other hand, α rays of radioactive sediments have positive influence that should be increased as big as possible in uranium prospecting on measuring results, which contribute to increasing the detection sensitivity and reducing the uncertainty of measuring results. At last, for most cups with certain size, solid α-radioelements under surface inside the cup have few influences on α-tracks measuring that can be ignored in actual measurement.
Key words:α-track measuring/
Uranium ore/
Radon/
Size of measuring-cup/
α-radioactive sediment/
Solid α-radioelement



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