One Method for Assessing Internal Dose Due to Tritium

In order to assess the internal exposure dose for radiation protection,reference biokinetic models and its parameters for radionuclide are recommended by International Commission on Radiological Protection（ICRP）.As an example in this paper,an individual biokinetic model for a tritiated water intake in an accident are developed based on the monitoring data of urine samples.The results show 25.5mSv of committed effective dose by developed individual biokinetic model,and 38.6mSv by reference model rec-ommended by ICRP.The deviations with reference value given by IAEA are 1% and 48%,respectively.