In assessing intakes of radioactivity, bioassay and in vivo retention,
experimental data must be compared with biokinetic model predictions.
The choice of model parameters and weighting of data from different s
ources requires judgement and experience on the part of the dosimetris
t. In the project described in this paper, knowledge-based programming
techniques are being developed to aid the dosimetrist in the various
decision making procedures which contribute to an internal dose assess
ment. Some of the principles which need to be incorporated in such a s
ystem are discussed and the current status of the Internal Dosimetry A
ssessment (IDA) system is described.