聚乙烯对γ吸收剂量测量的影响研究

Study on influence of polyethylene on measurement of γ-ray absorbance doses

研究了聚乙烯材料对于重铬酸银化学剂量计测量γ吸收剂量的影响.通过将平均分子质量在20万~30万u区间的聚乙烯放置于重铬酸银化学剂量计中制备为样品剂量计,分析其对于γ吸收剂量测量的影响.实验结果表明,样品剂量计与标准剂量计的比对偏差小于1.9%,样品剂量计测量数据平行偏差小于1%,且样品剂量计测量数据与辐照时间线性相关系数达0.999 7.说明聚乙烯材料在1 004~44 00Gy剂量范围内对重铬酸银化学剂量计测量结果影响很小,可以用聚乙烯材料替代玻璃安瓿制作剂量计测量标准玻璃剂量计无法测量的辐照部位,以保证产品、试件γ辐照吸收剂量的精确测量.

A study was performed to evaluate the influence of polyethylene(average molecular weight in 200 000~300 000)on the measurement ofγ-ray absorbance doses.The sample dosimeters were prepared with ferrous sulfate solute and polyethylene container and were then exposed to aγirradiation environment.The relative deviation was less than 1.9%between the sample dosimeters and the reference standard ferrous sulfate chemical dosimeters in the range of 1 000~4 400Gy.The linear correlation coefficient of the sample data and the irradiation time dosimeter was 0.999 7.It indicates that the polyethylene material can be used as a substitute container material of reference standard ferrous sulfate chemical dosimeters for the measurement of γ-ray absorbance doses in unaccessible complicated space.