“…The need to determine accurate decay data of various actinide radionuclides was identied by IAEA. 125,126 The scientists from CIEMAT, Madrid, Spain and IRMM (formerly CBNM), Geel, Belgium have been continuing an excellent collaboration and cooperation for more than two decades, and have produced the best data on the a-particle emission probabilities of several important radio-nuclides. [127][128][129][130][131][132][133][134][135][136][137][138][139] For the accurate determination of a-particle emission probabilities of different a-emitters, sources prepared by vacuum sublimation from a tungsten lament, of isotopically pure nuclides (99.9% or better) and high radiochemical purity, on quartz , and with a 150 mm 2 PIPS detector (to optimize the resolution and counting statistics) for a-emission probabilities.…”