The last version of the IDEA Expert System provides for all radionuclides whole body retention functions and excretion functions for urine and feces. In addition, some organ retention functions are provided for some selected radionuclides with respect to the interpretation of organ specific in vivo measurements (such as thyroid measurement of Iodine, lung measurement of Cobalt, or liver and skeleton measurement of Americium).

The new version IDEAplus provides more organ retention functions allowing for the interpretation of most organ specific in vivo measurements. In this context the retention of the alimentary tract is of special importance because it allows for the correction of the contribution from the alimentary tract to in vivo count rates.

The new version IDEAplus provides also excretion functions for all isotopes where in vitro measurements make sense, i. e. isotopes with a biological half-life > 1 h.