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ESR Microscopy and Dosimetry with a Portable ESR Spectrosetry

使用便携式 ESR 光谱仪进行 ESR 显微镜和剂量测定

基本信息

批准号：
62890007
负责人：
IKEYA Motoji
金额：
$ 5.38万
依托单位：
Physics Department, Faculty of Science, Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1989
项目状态：
已结题

项目摘要

Breakthroughs have been made in the ESR imaging methods and in the miniaturization of ESR spectrometers. First, a portable ESR spectrometer was designed using the permanent magnetic alloy of Nd-B-Fe (Neomax) invented by Sumitomo Special Metal Co.,. A small ESR spectrometer about 2.2kg in weight was made and commercially sold by the Sumitomo Special Metal Co., as an apparatus for educational student experiments. Another small ESR spectrometer which sweeps the microwave frequency rather than the magnetic field was designed and manufactured by the Microdevice Co. This is also being sold now as a frequency sweep portable ESR ipectrometer. These will be used for ESR dosimetry. Details of the spectrometers were described in the papers.Microscopic ESR imaging based on our new principles was named as ESR microscopy. Fiest, we have created intense magnetic field gradient by introducing small anti-Helmholtz coil pairs into microwave cavity. Superconducting coils were also used to create the field gradient of T/cm or the resolution of um. Second, the localized Magnetic field and scanned mechanically to get a scanning ESR image both by modulating the magnetic field and by electronically scanning the static magnetic field. Lastly, microwave field was localized to get an image.Application of these ESR microscopy procedures to microdosimetry was made by studying X-rayed and gamma rayed tooth pieces. Distribution of paramagnetic impurities and natural radiation effect was studied for fossils and natural minerals as well as for a synthetic diamond.

在ESR成像方法和ESR谱仪小型化方面取得了突破性进展。首先，使用住友特殊金属公司发明的Nd-B-Fe永磁合金（Neomax）设计了便携式ESR谱仪。由Sumitomo Special Metal Co.，作为学生教育实验的设备。另一种扫描微波频率而不是磁场的小型ESR光谱仪是由Microdevice公司设计和制造的。这也是现在作为频率扫描便携式ESR ipectrometer出售的。这些将用于ESR剂量测定。本文详细介绍了这些光谱仪的工作原理，并将基于这些新原理的显微ESR成像技术命名为ESR显微技术。首先，我们在微波谐振腔中引入反亥姆霍兹线圈对，产生了强磁场梯度。超导线圈也被用来创建T/cm的场梯度或μ m的分辨率。其次，通过调制磁场和电子扫描静磁场，对局部磁场进行机械扫描，以获得扫描ESR图像。最后，微波场被定位，以获得图像。这些ESR显微镜程序的微剂量学的应用，通过研究X射线和γ射线的牙齿碎片。本文研究了化石、天然矿物和人造金刚石的顺磁杂质分布和天然辐射效应。