【摘要】 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⁶⁰Co γ射线从50Gy到2×10⁴Gy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。更多还原

【Abstract】 -Dosimetric properties of the DL-alanine/ESR dosemeter are studied in this paper. The ESR signal of alanine can be linearily used for high-level dosime-try in the range from 50Gy to 20000Gy for 60Co @-ray. The measurement reproducibi-lity of the dosimetry system was obtained by taking out of sample from the cavity. The experiments show, the standard deviation of the readings being ±0.83%; the standard deviation being ±1.4% when the intersprecimen scattering of one group of sample irradiated to 1 kGy; in 3 months no significant changes occured to the long-term stability. Different factors influencing on the precision of dose measurement are also discussed such as. the position of the sample in cavity, the preparation processing of the sample, irradiation and storage temperature and air humidity during storge affects on the response of dosemeters. The calibration curves have been obtained from 4 ESR spectrometers, showing that the differences in parameters of the curves are quite great, which means the properties of the ESR spectrometer are also important factors in precise ESR dosimetry.更多还原