Development of a method for activity measurements of 232Th daughters with a multidetector gamma-ray coincidence spectrometer

The method for activity measurements of the 232Th daughters, developed at the six-crystal gamma-ray coincidence spectrometer PRIPYAT-2M and based on coincidence counting of the 583 and 2615 keV photons from cascade transitions which follow β−-decay of 208Tl, as well as on counting the 911 keV photons which follow β−-decay of 228Ac in the integral and non-coincidence mode of counting, is presented.