Natural radioactivity: the performance of modern measuring techniques

The determination of natural radionuclides in the environment is a complex question. Therefore, the optimization of the selection of suitable measuring methods is of particular importance. To this, the contributions of this main topic describe valuable experiences gained in praxis, also in the field of old residue rehabilitation, in this context, Radon measuring techniques play a special role, where the trend, thanks to modern equipment, goes more and more from passive measurements to the active and time-relevant assessment of Radon concentration. In this connection, the generation of the swiss Radon cart is also described. (orig.)