在体EPR专用磁场装置性能的改进

Improvement of the Magnet System in EPR Spectrometer for In Vivo Tooth Dosimetry

为测试在体EPR牙齿辐射剂量测量专用磁场装置,开展了初步性能试验.针对扫描磁场非线性造成谱线的畸变情况,对在体EPR专用磁场装置性能进行了改进,给出了一种校正扫描磁场非线性的实现方法,通过对扫描磁场驱动电流进行反向刻度校正,可有效改善EPR谱线的畸变情况.初步试验进一步证明了水平磁场在体测量方案的可行性,磁场装置性能的改进为实现X波段EPR辐射剂量在体测量向实际应用奠定基础.

Preliminary tests were carried out to evaluate the performance of the magnet system in an EPR spectrometer dedicated for in vivo tooth dosimetry. To reduce spectrum distortion, a method was proposed to rectify the nonlinearity of the scanning field via correcting of the driving current. The results of preliminary tests also demonstrated the feasibility of using horizontal magnet field for in vivo EPR.