论文部分内容阅读
本文研究了DL-丙氨酸ESR剂量计的剂量学特性。剂量计的ESR信号可以线性地用于~(60)Co γ射线从50Gy到2×10~4Gy剂量范围的高剂量测量。此剂量系统的测量重复性检验是在剂量计元件每次测量信号幅值之后,从谐振腔中取出再插入的情况下进行的,其相对标准偏差为±0.83％。照射以1kGy的一组元件信号幅值分散性也进行了检验,其相对标准偏差为±1.4％。测定了刻度曲线的长期稳定性,在一般实验室条件下,三个月内没有发现明显的变化。研究了各种影响剂量计测量精密度的因素,元件在腔中的位置、元件的制备工艺、辐照温度、贮存温度及贮存期间的湿度对剂量计的响应都有影响。在四台ESR谐仪上得到了刻度曲线。曲线参数上的差别是明显的,这说明在精密的ESR剂量测量中,谱仪的性能也是一项重要的因素。
This article investigates the dose-response characteristics of DL-alanine ESR dosimeters. The dosimeter’s ESR signal can be used linearly for high-dose measurements of ~ (60) Co γ-rays from 50 Gy to 2 × 10 ~ 4Gy. The measurement of repeatability of this dose system was performed with the relative standard deviation of ± 0.83% after the dosimeter element measured each signal amplitude, removed from the resonator, and then inserted. The signal amplitude dispersion of a set of components irradiated with 1 kGy was also tested with a relative standard deviation of ± 1.4%. The long-term stability of the calibration curve was determined. Under normal laboratory conditions, no significant changes were observed within three months. Various factors affecting the precision of the dosimeter were investigated. The position of the element in the cavity, the preparation of the element, the irradiation temperature, the storage temperature and the humidity during storage all affected the response of the dosimeter. The calibration curves were obtained on four ESR harmonic meters. The differences in the curve parameters are evident, indicating that spectrometer performance is also an important factor in precision ESR dose measurement.