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目的测定利用放射性同位素99mTcO4-和131I诊治过程中甲亢患者的受照剂量及周围环境的辐射水平,探讨加强其辐射防护的重要性。方法测量26例99mTcO4-检查患者及30例131I治疗患者给药24 h内,距患者1 m、2 m、3 m、4 m、5 m、6 m外的外照射水平,并用ICRP给出的核医学诊治时放射性核素的有关数据计算出病人的受照有效剂量。结果放射性核素诊治甲亢患者的剂量范围在2.3×10-2~5.0×102mGy/MBq,最高吸收剂量可达5.0×102mGy/MBq,并对周围环境造成一定辐射,距患者2 m处的外照射水平下降明显,服药后24 h外照射基本降至本底水平。结论加强对放射性核素诊治过程中患者的防护措施及管理是必要的。
OBJECTIVE: To determine the dose level of radiation and the surrounding environment of patients with hyperthyroidism during the diagnosis and treatment of 99mTcO4- and 131I radioisotopes, and to explore the importance of radiation protection. Methods Twenty-six patients with 99mTcO4-test and 30 patients treated with 131I were measured within 24 hours after treatment, and the levels of external radiation 1 m, 2 m, 3 m, 4 m, 5 m and 6 m away from the patients were measured. Nuclear medicine diagnosis and treatment of radionuclide data to calculate the patient’s effective dose. Results The dosage of radionuclide for diagnosis and treatment of patients with hyperthyroidism ranged from 2.3 × 10-2 to 5.0 × 102mGy / MBq, and the maximum absorbed dose was up to 5.0 × 102mGy / MBq, which caused some radiation to the surroundings, Significantly decreased levels, 24 h after taking radiation basically dropped to the background level. Conclusion It is necessary to strengthen the protective measures and management of patients in the course of diagnosis and treatment of radionuclides.