某市医用放射工作人员甲状腺功能调查与分析

目的 分析某市医用放射工作人员血清甲状腺激素水平，研究长期低剂量电离辐射对医用放射工作人员甲状腺功能的影响。方法 通过流行病学现况调查方法，按照放射工作人员职业健康检查规范的要求，对1615名医用放射工作人员甲状腺功能进行分析，测定血清中T₃、T₄及TSH的含量，并对测定结果结合个人剂量监测数据进行统计分析。结果 放射组人群年均个人有效剂量为0.23 mSv，属于低剂量接触电离辐射。放射组的T₃、T₄和TSH水平异常率均高于对照组，差异均有统计学意义（P<0.05）；按照工龄不同分为3组，各组间T₃、T₄和TSH水平比较P值均>0.05，无统计学意义；按照不同工种分组，除牙科放射组TSH与对照组比较P值>0.05，无统计学意义，其余各组与对照组比较P值均<0.05，有统计学意义。结论 长期接触小剂量电离辐射可能对放射工作人员的甲状腺功能产生影响。因此应进一步改善放射防护条件，加强放射工作人员的防护意识，保障作业人群的职业健康。

Analysis on thyroid function of medical radiation workers in a city

Objective Analysis of serum thyroid hormones in medical radiation workers in a city and the effects of long-term low-dose ionizing radiation on their thyroid function.Methods Through epidemiological survey methods, we analysed the thyroid function in 1615 medical radiologists by detecting serum T₃, T₄ and TSH content in accordance with the requirements of occupational health examination of radiation workers and conducted statistical analysis for the measurement combined with personal dose monitoring data.Results The annual average effective dose of radiation group was 0.23 mSv, which belonged to low dose contact ionizing radiation. The level of T₃, T₄ and TSH in treated group were all higher than those in the control group (P<0.05). According to the length of service, people were divided into three group and the levels of T₃, T₄, and TSH were not statistically significant among each group (P>0.05); Group by different types of work, except the TSH level of dental radiation group, the remaining groups were statistically significant compared with the control group (P<0.05).Conclusion Long term exposure to small doses of ionizing radiation may affect the thyroid function of radiation workers. Therefore, we should further improve the radiation protection conditions, strengthen the awareness of the radiation workers and ensure the occupational health of the workers.