Application of portable γ-ray spectrometer in monitoring thyroid 131 I in radiation workers

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Objective To apply Inspector 1000 portable γ spectrometer and its corresponding supporting software to the monitoring of thyroid 131I activity of radiation workers, and to estimate the internal radiation dose of medical staff in nuclear medicine department. Methods The spectrometer was calibrated and taken to participate in the 2018 thyroid radioactive iodine intercomparison program initiated by Lawrence Livermore National Laboratory in the United States to ensure the accuracy of the measurement; the spectrometer was used to measure 131I activity ofthe radiation workers of the nuclear medicine departments of two grade-A tertiary hospitals in Beijing and Jinan to verify the feasibility of the method. Results The Inspector 1000 portable γ spectrometer was qualified for international intercomparison. Measurement results from the grade-A tertiary hospital in Beijing showed that the thyroid 131I activity of each of 10 radiation workers was below the detection limit (33.30 Bq). Measurement results from the grade-A tertiary hospital in Jinan showed that the thyroid 131I activities of the 4 radiation workers were 64.05 Bq, 160.77 Bq, 416.67 Bq, below the detection limit (35.18 Bq) respectively, and of 3 of the 4 subjects 131I was detected in the thyroid, and their corresponding thyroid accumulative organ doses were 0.70 μSv, 1.77 μSv, and 4.58 μSv, respectively. Conclusion Inspector 1000 portable γ spectrometer has a strong feasibility for thyroid 131I monitoring of radiation workers in nuclear medicine. The spectrometer has a good application prospect in the field of radiation monitoring, and can play an important role in the field of radiation protection and nuclear emergency detection. 摘要： 目的 将Inspector 1000便携式丫谱仪及其相应配套软件应用于放射工作人员甲状腺 131I活度的监测中, 监测 核医学科放射工作人员内照射剂量。 方法 对谱仪进行刻度并参加了美国劳伦斯•利弗莫尔国家实验室发起的 2018年甲状腺放射性碘比对计划, 确保测量的准确性;利用该谱仪分别对北京市与济南市的2家三甲医院核医学科放 射工作人员进行测量以验证方法的可行性。 结果 该Inspector 1000便携式丫谱仪参加国际比对的结果合格。北京市 某三甲医院的测量结果显示10名放射工作人员的甲状腺 131I活度均低于最小可探测活度(33.30 Bq), 济南市某三甲医 院的测量结果显示4名放射工作人员的甲状腺 1311活度分别为64.05 Bq、160.77 Bq、416.67 Bq、低于最小可探测活度 (35.18 Bq), 4名被测对象中有3人的甲状腺内监测到 1311, 其对应的甲状腺待积器官剂量分别为0.70 μSv、1.77 μSv、 4.58 μSv。 结论 将Inspector 1000便携式丫谱仪应用于核医学科放射工作人员甲状腺 1311监测的可行性强, 该谱仪在 辐射监测领域有很好的应用前景, 可在放射防护领域、核应急现场检测领域发挥重要作用。