Estimation of 131I internal exposure of thyroid and dose to nuclear medicine staff in Zhejiang province
10.3760/cma.j.cn112271-20240509-00171
- VernacularTitle:浙江省碘治疗工作人员甲状腺 131I内照射水平及剂量估算
- Author:
Zhiqiang XUAN
1
;
Xiaoji HAO
1
;
Shunfei YU
1
;
Zhongjun LAI
1
;
Jiadi GUO
1
;
Yiyao CAO
1
;
Donghang WANG
1
;
Guijia HU
1
Author Information
1. 浙江省疾病预防控制中心，杭州 310051
- Publication Type:Journal Article
- Keywords:
Nuclear medicine;
131I;
Thyroid;
Internal exposure
- From:
Chinese Journal of Radiological Medicine and Protection
2025;45(6):531-536
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To investigate the current situation of nuclear medicine practices, determine the number of nuclear medicine staff, conduct internal exposure monitoring and dose estimation for nuclear mecidine staff engaged in 131I treatment in Zhejiang province. Methods:A survey was conducted over all the 22 hospitals involved in 131I treatment in the province. The 131I activity in thyroid of 96 stafff in 131I treatment workplaces were measured by means of direct method. At the same time, the effective doses from internal exposure were estimated and the influencing factors were analyzed. Results:131I activity in thyroids was found to be above the detection limit for 49 staff (51.04%) in nineteen hospitals. The maximum value of 131I activity was 629.18 Bq. There was no statistically significant difference in 131I detection rate in thyroid of 131I treatment staff between different positions, different genders and different levels of hospitals ( P>0.05). Comparisons of 131I activity of thyroid of nuclear medicine staff for theatment of thyroid cancers had shown that the highest was for nurses, followed by technicians and doctors, and the lowest was for cleaning staff ( H=6.39, P<0.05). The estimated committed effective dose to the nuclear medicine staff ranged from 0.05 to 2.37 mSv, with those below 1 mSv accounting for 93.88% of the total. Logistic regression analysis showed that nursing position was the risk factor contributing to the committed effective dose ( OR=2.805, 95% CI 1.076-7.314). Conclusions:In Zhejiang province, the committed effective dose to thyroid of nuclear medicine staff from 131I internal exposure was not in excess of the dose limit. However, the staff performing iodine therapy still need to strengthen protection against internal exposure and take scientific and effective protective measures to reduce the risk of health hazards from internal exposure.
