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[目的]通过测定碘-131(~(131)I)治疗分化型甲状腺癌(DTC)患者体外辐射水平和有关人员受照剂量,探讨~(131)I治疗过程中的辐射防护方法 ,使得在临床治疗过程中将辐射危害降到合理的最低水平。[方法]选择DTC术后行~(131)I治疗的患者10例及其陪同人员作为研究对象。患者服药后,用451P-DE-S1-YGG型电离室巡测仪测量即时、24h、72h、5d及7d不同时间点距患者5cm、50cm、100cm及200cm处的剂量当量率水平,用个人剂量测量30d内的个人剂量,采用谱仪测量服药室内空气中~(131)I的活度水平。[结果 ]服药即刻患者周围辐射剂量值非常高,可达2000μSv/h,5d后200cm处的辐射剂量率均小于5μSv/h;甲癌患者的个人剂量水平为26.78~61.96(46.25±11.58)m Sv,陪同人员的个人剂量水平中位数为0.35(0.29~0.43)m Sv;服药室空气中~(131)I的活度水平为42.6Bq/m3,工作人员每年因吸入~(131)I所致的有效剂量为0.019m Sv。[结论]甲状腺癌患者在行~(131)I治疗的过程中其周围具有较高的辐射剂量水平,应提高工作人员、患者和陪同人员的辐射防护意识,减少不必要的照射。
[Objective] To investigate the radiation protection of ~ (131) I in the treatment of patients with differentiated thyroid cancer (DTC) treated with iodine-131 (~ (131) I) Radiation hazards will be reduced to a reasonable minimum during clinical treatment. [Methods] Ten patients and their accompanying persons who underwent ~ (131) I treatment after DTC were selected as the study subjects. The patients were treated with 451P-DE-S1-YGG type ionization chamber tourimeter measuring instantaneous, 24h, 72h, 5d and 7d at different time points from the patient at 5cm, 50cm, 100cm and 200cm at dose equivalence rate, with personal dose The personal dose was measured within 30 days, and the activity of ~ (131) I in the indoor air was measured by spectrometer. [Result] The dose of radiation around the immediate patient was very high up to 2000μSv / h, and the radiation dose rate at 200cm after 5d was less than 5μSv / h. The individual dose of the patients with thyroid cancer was 26.78 ~ 61.96 (46.25 ± 11.58) m Sv. The median level of individual dose for escort was 0.35 (0.29-0.43) mSv. The activity level of ~ (131) I in the air of the medication room was 42.6Bq / m3. The resulting effective dose is 0.019 m Sv. [Conclusion] Thyroid cancer patients have a higher level of radiation dose around 131I treatment. The radiation protection awareness of staff, patients and their accompanying persons should be increased, and unnecessary radiation should be reduced.