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目的测量~(131)I治疗甲癌过程中病人周围辐射场的空间分布和随治疗时间的变化趋势,为甲癌治疗病房的屏蔽设计和该类项目的辐射环境管理提供参考。方法主动测量结合被动测量。结果病人服药5 min后,其胸前1 m处剂量率达到393μGy/h,随着治疗时间的增加,剂量率大幅衰减;整个治疗过程中,病人对距其最近的监测点处产生的累积剂量达到2.6 m Sv;对于病房内各个累积剂量监测点,前24 h产生的剂量占整个治疗过程所产生总剂量的57%~80%,前48 h产生的剂量占整个治疗过程所产生总剂量的80%~95%,治疗后期对总剂量贡献很小。结论测量结果较好地反映了~(131)I治疗整个分化型甲状腺癌转移病灶过程中所产生辐射场的源强和分布。
Objective To measure the spatial distribution of radiation field around patients and the changing trend with the treatment time during ~ (131) I treatment of A carcinoma, and to provide reference for the shielding design of the treatment room for treatment of cancer and the radiation environment management of such projects. Methods Active measurement combined with passive measurement. Results After 5 min of treatment, the dose rate at 1 m chest reached 393 μGy / h. With the increase of treatment time, the dose rate greatly declined. During the whole treatment, the cumulative dose Reaching 2.6 m Sv; for each cumulative dose monitoring point in the ward, the dose generated in the first 24 h accounted for 57% -80% of the total dose generated during the whole treatment process. The dose generated in the first 48 h accounted for the total dose 80% ~ 95%, the latter part of the total dose of small contributions. Conclusion The results of the measurement well reflect the source intensity and distribution of the radiation field generated by ~ (131) I in the treatment of metastatic lesions of differentiated thyroid carcinoma.