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检测4.2K低温金属环境下^(210)Po-α衰变半衰期变化的实验方法 被引量:2

A new method to check the change in α-decay half-life of ^(210)Po in metal at 4.2 K
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摘要 针对当前超低温金属环境下放射性核素α衰变半衰期变化实验研究存在的问题,建立了一种测量金属Bi环境下核素210Po-α衰变半衰期的新方法:创建放射性核素210Po处于4.2 K液氦、完全金属环境和金属氧化物环境。放射性衰变计数α谱学方法测量不同环境中的210Po的半衰期及其变化。初步实验表明,210Po在超低温(4.2 K)金属环境下α衰变的半衰期,与常温下半衰期相比有明显的减小,此实验结果与德拜模型预言半衰期将缩短的倾向基本一致。 In order to solve problems in measuring α-decay half-life of 210Po in metal at ultra-low temperature,a new method to check the change in α-decay half-life of 210Po nuclide in metal at 4.2 K is proposed.A significant decrease of the half-life of 210Po in metal Bi at 4.2 K is observed.The half-life of 210Po was 105.2±4.4 d at 4.2 K,while it is 138.5±1.4 d at room temperature,with difference of 24.1%.The experimental result was consistent with the prediction tendency of the Debye-Huchel model.
出处 《核技术》 CAS CSCD 北大核心 2011年第7期503-506,共4页 Nuclear Techniques
基金 国家自然科学基金资助项目(10491085)资助
关键词 金属环境中放射性核素 液氦低温 半衰期 Α衰变 Nuclide in metal Liquid helium temperature Half-life α-decay
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