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为了建立医学、农业和辐射加工(~60Co γ射线)吸收剂量国家标准,精确测定了Frieke剂量计中Fe~(3+)离子摩尔消光系数ε_m值,着重研究了邮寄玻璃安瓿剂量计的制备方法和工艺,采用老化和预辐照剂量计溶液的办法进行质量控制,有效地清除了有害杂质的影响,使未辐照剂量计的本底读数十分稳定,提高了测量精度。同时,试验观察了影响吸收剂量测量的一些因素;考查了剂量计的复现性和长期稳定性;并进行了医用(限束)和工、农业(非限束)~(60)Co γ射线水模体中校准点处吸收剂量的测量以及与标准照射量计(Farmer 2560)的比对。结果表明,在测定~(60)Co γ射线(限束与非限束)水中吸收剂量量值,当剂量范围为(40～400)Gy时,测量的重复性有效地控制在±1.0％以内(95％置信度),总不确定度在±1.9％以内。
In order to establish the national standard of absorbed dose of medicine, agriculture and radiation processing (~ 60Co γ-ray), the molar extinction coefficient ε_m of Fe 3+ ion in Frieke dosimeter was accurately measured. The preparation method of mail glass dosimeter was emphatically studied And process, using aging and pre-irradiation dosimeter solution quality control, effectively remove the impact of harmful impurities, so that the background of the unirradiated dosimeter readings are very stable and improve the measurement accuracy. At the same time, some factors affecting the absorbed dose measurement were observed. The repeatability and long-term stability of the dosimeter were examined. The effects of medical (limited beam) and industrial (unconfined) ~ (60) Co γ-ray Measurements of absorbed dose at calibration points in water phantoms and alignment with a standard irradiance meter (Farmer 2560). The results showed that the repeatability of the measurement was effectively controlled within ± 1.0% at doses ranging from (40 to 400) Gy in the determination of absorbed dose in ~ (60) Co γ-rays (95% confidence) with an overall uncertainty of within ± 1.9%.