125I粒子植入治疗的前列腺癌患者出院后对周围人员辐射水平的研究

摘要

目的:对植入碘125(125I)粒子的前列腺癌患者出院后对周围辐射水平进行研究,评估辐射危害并提出防护建议.方法:对放射性125I粒子前列腺植入术治疗患者在出院后9个月内,对周围不同距离处的辐射剂量率进行测量,计算对周围的辐射水平,评估辐射危害.结果:植入125I粒子患者周围的剂量率以患者身体后方最大,身体前方次之,身体侧方最低.随时间的变化,剂量率在3个月前基本为指数下降,3个月后检测值明显高于理论计算值.结论:植入125I粒子的患者出院后,随着时间及距离增加,患者周围剂量率快速下降.建议在术后2个月内患者避免与他人、尤其是孕妇和儿童近距离接触,应穿戴铅防护用品,以减少对周围人的辐射.%Objective: To investigate the radiation exposure around implanted 125I seeds patients with prostate cancer for others post discharge so as to evaluate radiological hazard and propose suggestions for radiation protection. Methods: The radiation dose rates of different distance around implanted 125I seeds patients with prostate cancer within 9 months post discharge were measured. And the surrounding radiation level were calculated and radiological hazard was evaluated according to the dose rates. Results: The largest radiation dose rate around implanted 125I seeds patient was behind the body of patient, and the middle dose was in front of the body of patient, and the lowest dose was in side of the body of patient. With changing of time, the dose rate basically occurred exponential decay at the first 3month, and then the detection value was significantly higher than theoretical calculating value beyond 3 months after implantation. Conclusion: When implanted 125I seeds patients post discharge, the radiation dose rate around them will fast decrease with the increasing of time and distance. It was suggested that the patient should avoid closely contact with other people, especially pregnant woman and child, or they should dress lead protective supplies, within 2 months after implantation so as to reduce radiation exposure to other people around patient.