Variation measurements of decay constants of Tc-99m as a chemical tracer

Tc-99m作为化学示踪剂的衰变常数的变化测量

• 批准号: 24740136
• 负责人: KIKUNAGA Hidetoshi
• 金额: $ 2.75万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2012
• 资助国家: 日本
• 起止时间: 2012-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-24740136/
• 关键词: 半減期測定; 壊変定数; 化学効果; テクネチウム; クロム

The decay constants of some nuclides which decay via the internal conversion and electron capture process are changed with changing environmental factors such as its chemical states. Examples of this type of nuclides are metastable state of Tc-99 (Tc-99m) and Cr-51. There is a possibility that the variation measurement of the decay constants with radiation detection is able to use as a chemical tracer.In this study, an apparatus for precise measurement of the decay constants was developed at first. The decay constants of these nuclides were precisely measured with various chemical states to investigate the effects of chemical states on the decay constants of nuclides. In the case of Cr-51, the relative differences of the decay constant between chemical states of Cr-51 were compared with a simple theoretical model.

某些核素通过内转换和电子俘获过程衰变，其衰变常数随环境因素（如化学状态）的变化而变化。这种类型的核素的实例是亚稳态的Tc-99（Tc-99 m）和Cr-51。利用辐射探测技术测量衰变常数的变化有可能作为化学示踪剂，本研究首先研制了一套精确测量衰变常数的装置。在不同的化学状态下，精确测量了这些核素的衰变常数，以研究化学状态对核素衰变常数的影响。在Cr-51的情况下，Cr-51的化学状态之间的衰变常数的相对差异进行了比较与一个简单的理论模型。

项目成果

Comparison of the decay constants of 51Cr with various valence states

不同价态51Cr的衰变常数比较

• 发表时间: 2013
• 作者: H. Kikunaga et al.