Abstract: The paper introduces the IAEA Safety Report Series No. 19 (SRS 19) and the revised version of SRS 19; expounds the necessity of revision and summarizes the changes of screening coefficient of the three kinds of discharge pathways, namely surface water discharge, air discharge and sewage pipeline system discharge. The paper also provides reference for prospective assessment of public exposure and environmental impact caused by radioactive material discharge.

Key words: revised SRS 19, screening coefficient, environmental impact assessment