Abstract: DOSE MONITORING OF ~(125)ⅠIN THE THYROID GLANDSOF LABELLING WORKERS IN BEIJING ANDESTIMATION OF DOSE EQUIVALENTHe lihua；Song Yuchun（China Institute of Atomic Energy,Beijing 102413）Bai Jiaxiang ；Hao Yunfang（Beijing Municipal Centre For Hygiene And Epidemic Control,Beijing 100013）ABSTRACTThe results of ~(125)Ⅰ monitoring in the thyroid of labelling workero in Bijing are presented. Thyroidof 79 workere engaged in routine ~(125)Ⅰ-labelling in the severai laberatories of Bijing are monitored.Among themseventy-eight workere presents a ~(125)Ⅰobvious contamination. The deposition of ~(125)Ⅰ in thethyroid glands is within the range of 0. 01－6. 32 kBq. The estimated intake for workere is lower than1／10 of arunual limit of intake. Colledctive dose equivalent is 27. 72 man ·mSv. The per capita doseequivalent is 0. 35 mSv.Key words thyroid collective dose equlvaient per capita dose equivalent deposition