This paper describes new biokinetic and dosimetric models, especially those being developed by ICRP which will be used in the forthcoming documents on Occupational Intakes of Radionuclides. It also presents the results of a working group within the European project CONRAD which is being continued within EURADOS. This group is implementing the new models, performing quality assurance of the model implementation (including their description) and giving guidance to the scientific community on the application of the models for individual dose assessment. The dosimetry of internal radiation emitters is based on biokinetic and dosimetric models. Such models are developed by the International Commission on Radiological Protection (ICRP). At present, ICRP is revising its Publications 30(1), 54(2), 68(3) and 78(4) on radiation protection for workers by preparing new reports on Occupational Intakes of Radionuclides (OIR), which will provide updated dose and bioassay coefficients.