LRAD管道内两面源的放射性测量技术

针对核设施退役管道中多点或大面积污染情况，采用自主研制的新型长距离α探测技术（LRAD）测量系统，开展了管道中不同参数下两面源（不同核素、不同面活度的α（面源）污染影响特征的对比实验。实验结果表明：两面源相对间距为10cm时，探测效率均高于相对间距为0cm、20cm、40cm三种情况，与理论分析相吻合；241Am源距电离室近、^1399Pu源距电离室远的测量结果大于两面源前后位置颠倒的测量结果；两个面源同时测量值小于两个面源在相应位置单独测量值之和。所以多面源对LRAD测量值具有一定的影响规律，可为管道内α核素污染测量研究提供一定的技术参考价值。...

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Bibliographic Details
Published in	核技术 Vol. 36; no. 10; pp. 31 - 37
Main Author	李平川庹先国郑洪龙刘明哲吴雪梅杨剑波
Format	Journal Article
Language	Chinese
Published	成都理工大学核技术与自动化工程学院成都610059%西南科技大学绵阳621010 2013 成都理工大学地质灾害防治与地质环境保护国家重点实验室成都610059%西南科技大学绵阳621010%成都理工大学核技术与自动化工程学院成都610059 成都理工大学地质灾害防治与地质环境保护国家重点实验室成都610059
Subjects	两面源探源距相对位置长距离α探测技术（LRAD） Detector-source distance 长距离α探测技术(LRAD) Two-surface source 相对位置 Relative distance Long Range Alpha Detector (LRAD) 两面源探源距
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ISSN	0253-3219

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Summary:	针对核设施退役管道中多点或大面积污染情况，采用自主研制的新型长距离α探测技术（LRAD）测量系统，开展了管道中不同参数下两面源（不同核素、不同面活度的α（面源）污染影响特征的对比实验。实验结果表明：两面源相对间距为10cm时，探测效率均高于相对间距为0cm、20cm、40cm三种情况，与理论分析相吻合；241Am源距电离室近、^1399Pu源距电离室远的测量结果大于两面源前后位置颠倒的测量结果；两个面源同时测量值小于两个面源在相应位置单独测量值之和。所以多面源对LRAD测量值具有一定的影响规律，可为管道内α核素污染测量研究提供一定的技术参考价值。
Bibliography:	Long Range Alpha Detector （LRAD）, Two-surface source, Detector-source distance, Relative distance 31-1342/TL Background： The development of measuring technologies of radioactive contamination becomes more and more important. Long Range Alpha Detector （LRAD） can effectively solve some problems such as the short ranges of alpha particles, weak penetration ability and so on. LRAD also has advantages that the alpha radioactivity of interior surface of irregular pipes or just irregular surface can be measured nondestructively and precisely. Purpose： This paper attempts to obtain the measured value of multi-point sources and large contamination areas in pipes. And the comparative experiments of impact factors of two different radioactive surface sources （different nuclides and radioactivities） have been done. Methods： In the experiment, a new domestic LRAD is utilized to measure the alpha activity of interior surface of steel pipes. Here, the inner diameter of pipes is 78 nun and there are two kinds of pipes： straigh
ISSN:	0253-3219