Abstract: The internal dose, which couldn't be directly measured, can only be calculated from the biokinetics model, dose model and related parameters based on the activity measurement results. Since the 1880's, there have been lots of changes in the relevant fields of dose models, biokinetics models, and radiological decay related parameters, thus forming a new calculation framework. Since its No.130 published in 2015, ICRP has released a series of reports to replace ICRP No.30, No.68, No.54 and No.78 (not yet finished), giving the dose coefficient under this framework and the latest results on the interpretation of biological sample measurements, such as the Z(t) function, which can be directly used to calculate effective dose based on the activity measurement results. We select 32 common nuclide to compare the old data with the new calculation results of ICRP. It can be seen that the dose coefficients of various nuclides given in the new publications have basically changed, and the absorption types are more diversified.

Key words: Radiation protection, Internal exposures, Dose coefficient, ICRP