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作 者 ：温祝堂;骆日佑;李宇;郑粤美;

期 刊 ：核农学报 1987年 1卷 04期 页码：117-122

关键词：辐射加工；吸收剂量；剂量计；

摘 要 ：本文采用在硫酸铈(Ce~(4+))体系中,加入硫酸铜(Cu~(2+))的方法,改进铈(Ce~(4+))剂量体系的稳定性。实验测定Ce~(4+)/Cu~(2+)体系中,Ce~(4+)的摩尔吸光度5643±451.M~(-1).cm~(-1)。在150—4×10~4Gy范围内,用三种Ce~(4+)浓度,测定水深5厘米校准点的G(Ce~(3+))为2.20±0.04。研究表明,G(Ce~(3+))值随辐照温度的上升而线性下降,测得辐照温度修正系数为-(5.13±0.07)×10~(-3)/℃。在Ce~(4+)溶液体系中,加入0.1M Cu~(2+),使剂量体系趋于稳定。对非限束~(60)Coγ源,水中校准点吸收剂量不确定度±3.3%,重复性好于±2.5%。Ce~(4+)/Cu~(2+)适宜作为辐射加工中高剂量区的参考剂量计。

Abstract:The ceric/cupric chemical dosimeter was investigated using cobalt-60 radiation at three Ce+4concentrations overs a dose range of 150 Gy to 40 kGy.Tke resulting value for the molar absorptivity was 5643±451.M-1.cm-1.A G(Ce3+)value of 2.2±0.04 was determined for 0.5-10 mM(Ce+4)/0.1M Cu+2 at 5cm (H2O).G(Ce3+)decreased approximately linearly with increase in irradiation temperature.The accuracy for the determination of absorbed dose at calibrated point of 5cm(H2O)is better than ±3.5%.The reproducibi-lity is better than ±2.5%.

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