Calculation Manuscript of Research on the Clearance level for liquids released with Medical Radioisotopes99mTc,131I,90Y,223Ra

The activity concentration in the air during sludge combustion was also calculated. At the same time, the surface activity concentration of riverbank sediment and the activity concentration in fish and crops in the river scenario were calculated.

External radiation doses from sludge on the ground and internal radiation doses from inhaling suspened sludge to sewage treatment plant workers were calculated based on the activity concentration of the medium. Internal radiation doses caused by inhaling contaminated air generated from sluge combustion and external exposure doses caused by immersion in the contaminated air to the public in the combustion plant were calculated. external exposure doses resulted from radionuclide in the riverbank sediments，as well as internal exposure doses caused by intaking of fish and crops were calculated.