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DEVELOPMENT OF HIGH SENSITIVE RADIATION DOSIMETER USING LITHIUM-ORGANIC ACID COMPOUNDS

有机锂化合物高灵敏度辐射剂量计的研制

基本信息

批准号：
13480147
负责人：
IKEYA Motoji
金额：
$ 6.08万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

项目摘要

A high sensitive and tissue equivalent radiation dosimeter material for electron spin resonance (ESR) dosimeter has been developed using lithium-organic acid compounds. Several Li- and Mg-organic acid compounds were irradiated by gamma rays from the source of 60Co at room temperature and measured with ESR to analyze the signals of radiation-induced radicals and to obtain their formation efficiency, G-value (Radical pairs per100eV). ESR spectroscopy utilizing magnetic field modulation at 100kHz give a derivative line of the microwave absorption. Hence, the sharper the line width, higher signal to noise (S/N) ratio.Li- and Mg-oxalate and other several organic compounds such as Li-lactate, Mg-lactate, Li-trifluoo-methane-sulfonate, Li-oxalate, Mg-oxalate. Among these compounds, Li-oxalate, LiOOC-COOLi a candidate since they do not contain any hydrogen atom which broaden the ESR signal of radicals by the hyperfine and super-hyperfine interactions.Other materials such as LiZrO_3 coesite and … More styshovite (SiO_2) and natural minerals have been investigated from the viewpoint of ESR dosimetry and radiation effects. Publications of the works on some natural minerals and Antarctic ice as well as ice in a laboratory were added in the list of publication to show our research activities.International Symposium on ESR Dosimetry and Dating was held at Osaka University (2001-ESRDD-Osaka) to summarize the works in these fields and to give a new prospect at the start of 21st century. Proceedings of the paper was edited and published in Advances on ESR Applications. Finally a book "New Applications of Electron Spin Resonance-Dating, Dosimetry and Microscopy" was updated, partially revised and published by the World Scientific Publishing Co. in Singapore. The new prospects and early works in 21st century were reviewed in the first chapter of the book Paramagnetic Resonance: Specialist Periodical Reports Vol.19 published by the Royal Society of Chemistry at the end of 2004.The principal investigator on his retirement would like to thank the research reviewers and all persons concerned for supporting this work and the field of ESR dosimetry and dating for these three decades. I am happy to have established a field of ESR dating and dosimetry. Less

利用锂-有机酸化合物研制了一种高灵敏度、组织等效的电子自旋共振（ESR）剂量计材料。用~（60）Co源的γ射线在室温下辐照几种Li-和Mg-有机酸化合物，并用ESR测量，分析辐照诱导自由基的信号，得到它们的生成效率G值（每100 eV自由基对）。利用100 kHz磁场调制的ESR谱给出微波吸收的导数线。因此，线宽越窄，信噪比（S/N）越高。Li-和Mg-草酸盐和其它几种有机化合物，如Li-乳酸盐、Mg-乳酸盐、Li-三氟-甲烷-磺酸盐、Li-草酸盐、Mg-草酸盐。在这些化合物中，草酸锂、LiOOC-COOLi由于不含氢原子而使自由基的ESR信号通过超精细和超超精细相互作用而展宽，是一种候选化合物。 ...更多信息本文从ESR剂量学和辐射效应的角度研究了硅镁石（SiO_2）和天然矿物的ESR辐射效应。2001年在大坂大学召开了ESR剂量学和测年国际研讨会（2001-ESRDD-Osaka），总结了这方面的工作，并展望了世纪之初的新前景。该论文的论文集被编辑并发表在《ESR应用进展》上。最后，世界科学出版公司在新加坡更新、部分修订并出版了一本书“电子自旋共振年代测定、剂量测定和显微镜的新应用”。在2004年底由英国皇家化学会出版的《顺磁共振：专家期刊报告》第19卷的第一章中，对21世纪的新前景和早期工作进行了回顾。退休的主要研究者在此感谢30年来对这项工作以及ESR剂量学和测年领域的支持。我很高兴建立了ESR测年和剂量学领域。少