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本文论述了技术改造后硫酸亚铁吸收剂量基准测量系统测量水吸收剂量的工作原理及特点,分析了其不确定度。精确测定了Cary-4G紫外可见分光光度计的Fe3+离子摩尔消光系数,完善了玻璃安瓿剂量计的制备方法和工艺,提高了硫酸亚铁吸收剂量基准测量系统测量Co60γ射线的水吸收剂量的剂量学性能。结果表明:技术改造后的基准测量系统在40~400Gy范围内,测量重复性好于±0.5%,测量扩展不确定度为1.9%(k=2),达到了原硫酸亚铁吸收剂量基准测量系统测量Co60γ射线的水吸收剂量高剂量学的剂量性能标准。该基准在1998年参加了B IPM组织的国际比对,在5 kGy、15kGy和35kGy三个剂量水平的测量值与参加比对的6个国家的整体平均值的一致性均在0.5%以内。
This paper discusses the working principle and characteristics of the measured dose of absorbed water after the technological transformation of the reference standard of the absorbed dose of ferrous sulfate, and analyzes its uncertainty. The molar extinction coefficient of Fe3 + ion of Cary-4G UV-Vis spectrophotometer was accurately measured, and the preparation method and technology of glass ampoule dosimeter were improved, and the dosimetry of measuring the absorbed dose of Co60γ ray by the reference system of absorbed dose of ferrous sulfate performance. The results show that the standard measurement system after technical renovation is in the range of 40 ~ 400Gy, the measurement repeatability is better than ± 0.5%, and the measurement uncertainty of expansion is 1.9% (k = 2), reaching the baseline measurement of absorbed dose of ferrous sulfate System Measures Co60γ-ray Water Absorption Dose High-dose dosimetry performance standards. The benchmark participated in an international alignment of the B IPM organization in 1998. The five 5 Gy, 15 kGy and 35 kGy dose levels were consistently within 0.5% of the overall average of the six countries participating in the benchmark.