Objective To analyze the individual dose monitoring results of radiation workers from occupational external exposure in Hangzhou from 2018—2022, in order to provide reference for the scientific management of radiation protection for radiation workers.
Method The results of individual dose monitoring of radiation workers in 88 medical institutions in Hangzhou from 2018—2022 were collected using stratified random cluster sampling, and the individual doses of radiation workers in different occupational categories, types of medical institutions, and working age were analyzed. The Kruskal Wallis H test was used for inter group comparisons of metric data, and Kruskal Wallis one-way ANOVA (k samples) was used for pairwise comparisons. 2×4 chi square test was used to compare the differences in the number of individuals whose annual effective doses was<1 mSv and ≥1 mSv across different occupational categories, types of medical institutions, and working age among radiation workers.
Result The study included personal dose monitoring data from 11 641 radiation workers. The annual collective effective dose was 2.471 person·Sv, and the per capita annual effective dose was 0.12 (0.06, 0.23) mSv/a. 11 450 radiation workers had an individual annual effective dose<1 mSv, accounting for as much as 98.36%. There were statistically significant differences in the per capita annual effective dose of radiation workers among different occupational categories, types of medical institution, and working age groups (H=428.922, 472.782, 108.037; all P<0.001). In terms of occupational categories, the per capita annual effective dose in radiation diagnosis, radiation therapy, nuclear medicine, and interventional radiology was 0.12(0.06, 0.22), 0.18(0.10, 0.29), 0.19 (0.10, 0.30), and 0.09 (0.05, 0.20) mSv/a, respectively. Among different types of medical institutions, the per capita annual effective dose of radiation workers in provincial, municipal, county-level, and private medical institutions was 0.16(0.08, 0.26), 0.10(0.06, 0.17), 0.11(0.05, 0.21), and 0.14(0.07, 0.23) mSv/a, respectively. According to working age grouping, the per capita annual effective dose for radiation workers with working age<10 years, 10≤working age<20 years, 20≤working age<30 years, and≥30 years was 0.11(0.06, 0.22), 0.15(0.07, 0.25), 0.14(0.07, 0.25) mSv/a, and 0.15(0.06, 0.26), respectively.
Conculsions The per capita annual effective dose of radiation workers in Hangzhou is at a low level, but the individual dose of interventional radiology workers fail to reflect the real level. It is necessary to strengthen the management of standardized wearing, and carry out refined and differentiated management of radiation workers in terms of radiation protection management.
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