Improving models

It is shown, that improving a parameter means to minimize the distribution of the parameter values so that at least the range of the results gets smaller. Special emphasis is put on the transfer processes soil/plant, feed/meat or milk and water/fish. Basically three methods are suggested to minimize the distributions of the individual parameters and the results: By including measured specific parameters instead of standard parameters, by considering important parameters within equations to describe a transfer process and by considering the antagonismens between radionuclides and regulated essential elements and introducing the OR (observed ratio) factor. (orig./HP)