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目的测定碘-131(131I)治疗过程中患者周围剂量当量率水平和有关人员的受照剂量,探讨加强131I治疗过程中辐射防护的重要性。方法采用随机抽样方法,以10例接受131I药物治疗的甲状腺癌患者及其陪同人员为调查对象。患者服药后,采用光激发光剂量计测量30 d内个人剂量,用X、γ剂量率仪测量距患者不同距离处的周围剂量当量率水平,用γ能谱仪测量服药室空气中131I活度水平。结果治疗过程中患者的个人剂量水平为25.14~79.25(50.08±14.76)m Sv,陪同人员个人剂量水平中位数为0.35(0.29~1.06)m Sv;距离患者5.0 cm和1.0、2.0、3.0 m处的胸前剂量当量率水平均高于其背部及左、右两侧(P<0.01);服药室空气中131I活度水平为45.9Bq/m3,工作人员每周因吸入所致待积有效剂量为0.42μSv,每年因吸入所致待积有效剂量为0.02 m Sv。结论在131I治疗过程中,患者周围具有较高的辐射水平,应提高患者和陪同人员的防护意识,加强防护和管理。
Objective To determine the dose equivalence rate of patients around iodine-131 (131I) treatment and the dose of relevant personnel, and to explore the importance of radioprotection in strengthening 131I treatment. Methods A random sample of 10 patients with thyroid cancer undergoing 131I treatment and their accompanying staff were included in this study. After the patient took the medicine, the personal dose was measured within 30 days with the photoplethysm dosimetry, the dose equivalent rate around the patient at different distances was measured with X, γ dose rate meter, and the 131I activity in the air of the medicine room was measured with γ spectrometer Level. Results The individual dose level was 25.14 ~ 79.25 (50.08 ± 14.76) m Sv and the individual dose level of escort was 0.35 (0.29 ~ 1.06) m Sv during the course of treatment. The average dose was 5.0 cm and 1.0, 2.0, 3.0 m (P <0.01). The activity level of 131I in the air of the medication room was 45.9Bq / m3, and the staff members were expected to be active every week due to inhalation The dose is 0.42μSv, due to inhalation caused by the effective dose to be plotted 0.02 m Sv. Conclusion In the course of 131I treatment, the patient has a higher level of radiation around the patient, should increase awareness of patients and their escort protection, and strengthen protection and management.