Abstract:
Objective To determine the activity levels of 131I in the thyroids of nuclear medicine staff in Guangzhou, estimate the internal radiation dose received by these staff, and assess their internal radiation risk.
Methods From September to November 2023, a convenience sampling method was used to select 50 nuclear medicine staff from four hospitals in Guangzhou that conduct nuclear medicine diagnostics and treatments. A portable RT31EPT15 thyroid measurement device was used to directly measure the activity levels of 131I in the thyroids of the staff. The intake of 131I was estimated, and the annual committed effective dose was derived.
Results Among these 50 nuclear medicine staff, 7 individuals were found to have detectable levels of 131I in their thyroids, with a detection rate of 14%. There were no statistically significant differences in detection rates among different genders and job positions(P > 0.05). Among 7 individuals with detectable 131I, the activity levels ranged from 60.8 to 143.6 Bq, with a mean of 84.1 Bq and a median of 83.7 Bq. The annual effective dose levels for physicians, technicians, and nurses were 0.29 mSv/year, 0.38 mSv/year, and 0.54 mSv/year, respectively.
Conclusions The annual effective dose values of internal radiation for these 50 nuclear medicine staff in four hospitals in Guangzhou were within the standard limits. However, the risk of internal radiation exposure should not be overlooked. Routine monitoring of internal radiation doses among nuclear medicine staff should be conducted to ensure their occupational health.
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