A set of partial working procedures has been designed for laboratory modelling and measurement of affecting termite caste differentiation by a juvenogen. The developed measuring system is based on selection of termite individuals by transmission X-ray radiography and by radioactivity measurement of the selected individuals. It permits to use only a single worker and a single soldier from the whole experimental group to evaluate their different radioactivities as well as the ratios of these values to the radioactivity applied into the experiment.