National Monitoring and Analysis of Internal Exposure of Nuclear Medicine Workers in I Treatment - China, 2021-2023.

What Is Already Known On This Topic?: Healthcare workers in I treatment facilities face potential occupational internal exposure through inhalation of volatile radioiodine, in addition to external exposure.

What Is Added By This Report?: This study presents the first comprehensive national monitoring data on internal exposure among Chinese nuclear medicine (NM) workers. Approximately one-fifth of personnel working at radioiodine treatment sites showed detectable levels of I in their thyroid tissue.

What Are The Implications For Public Health Practice?: These findings provide essential baseline data for enhancing radiation protection protocols in NM facilities and optimizing national internal exposure monitoring.