Analysis of individual dose monitoring results of occupational external radiation in radiation workers of non-medical institutions in Shanghai
- VernacularTitle:上海市非医疗放射工作人员个人剂量监测结果分析
- Author:
Tong HUANG
1
;
Hong XIAO
2
;
Xuesong ZHOU
1
;
Minpeng HUANG
2
;
Fajian LUO
2
;
Aijun QIAN
2
;
Linfeng GAO
2
Author Information
- Publication Type:Investigation
- Keywords: non-medical radiation worker; individual dose monitoring; per-capita annual effective dose; collective effective dose
- From: Journal of Environmental and Occupational Medicine 2025;42(12):1504-1509
- CountryChina
- Language:Chinese
-
Abstract:
Background With the widespread application of ionizing radiation technology in non-medical fields, the number of non-medical radiation workers has steadily increased over the years. Individual dose monitoring serves as a crucial measure to safeguard the occupational health of non-medical radiation workers, as it can accurately identify occupational health risks and optimize radiation protection strategies. Objective To analyze the individual monitoring data of radiation workers from partial non-medical sectors in Shanghai from 2016 to 2023, to obtain the status of occupational radiation exposure and to provide a reference basis for non-medical radiation hygiene supervision and protection management. Methods The study subjects consisted of radiation workers from non-medical institutions in Shanghai who recieved individual dose monitoring at a Class-A radiation health technical service institution between 2016 and 2023. Under the Specifications for individual monitoring of occupational external exposure (GBZ 128-2019), thermoluminescence dosimetry was used for measuring personal dose equivalent, Hp(10), of various occupations encompassing industrial irradiation, industrial radiography, radioisotope production, accelerator operation, other industrial applications, education, and veterinary medicine. Kruskal-Wallis H test was used for comparison among multiple groups, Bonferroni method was adopted for pairwise comparison, and Mann-Kendall test was conducted for trend analysis to analyze the per-capita annual effective dose and its variation over time across different occupational categories of radiation workers. Results A total of
13728 person-times of non-medical radiation workers were monitored from 2016 to 2023, accumulating a collective effective dose of3025.69 person-mSv. The per-capita annual effective dose M(P25, P75) was 0.14(0.08, 0.25) mSv. There were statistically significant differences in the per-capita annual effective dose of radiation workers in different years (H=874.826, P< 0.05). Similarly, significant variations were identified among various occupational categories (H=115.569, P< 0.05). Among them, the per-capita annual effective dose of radiological workers engaged in the production of radioactive isotopes was the highest, at 0.21(0.14, 0.32) mSv, followed by those in veterinary medicine, at 0.17 (0.11, 0.61) mSv; the difference between these two groups was not statistically significant (Z=1.231, P > 0.05), but both were significantly higher than those in other occupational categories (Z=3.913, 9.761, P<0.05). The veterinary medicine category had the highest proportion of monitored individuals with annual effective dose exceeding 1 mSv to the total number of monitored individuals(NR1), reaching 17.12%, and the industrial radiography category showed the highest proportion of workers exposed to more than the annual investigation level 5 mSv to the total number of monitored individuals (NR5), at 0.16%. Conclusion From 2016 to 2023, the overall individual doses of some non-medical radiation workers in Shanghai remain low, indicating well-controlled radiation levels in workplaces and low exposure risks. It is necessary to focus on radiation workers engaged in radioisotope production, veterinary medicine and industrial radiography.
