本文叙述了在更换研究性重水反应堆内壳中的辐射防护方法、辐射监测与评价。所采取的辐射安全管理和辐射防护措施有效地保证了工作人员、工作场所及周围环境的安全。更换内壳所用集体剂量当量为23.37人·雷姆,其中外照射为22.4人·雷姆,它主要来自~(60)Co 的贡献。氚所产生的集体剂量当量为0.97人·雷姆,其它核素的污染均小于 MPBB的0.15%。 This article describes the radiation protection methods, radiation monitoring and evaluation in the replacement of research heavy water reactor inner shell. Radiation safety management and radiation protection measures taken to effectively ensure the safety of staff, the workplace and the surrounding environment. The collective dose equivalent used to replace the inner shell was 23.37 persons · Rehm, of which the external radiation was 22.4 persons · Rehm, which mainly came from the contribution of ~ (60) Co. The collective dose equivalent produced by tritium was 0.97 person · reim, and the pollution of other nuclides was less than 0.15% of that of MPBB.