Marked disequilibrium between 234-Th and 230-Th of the 238-U natural radioactive decay chain in IAEA reference materials n. 312,313 and 314
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AbstractA new laboratory for the spectroscopy of natural radioactivity with a good energy resolution is presented. It consists of two distinct parts equipped, respectively, the first one with a HpGe g-ray detector, whose setup has been already completed, and the second one with large area Silicon a-ray detectors and a radiochemical section for thin a-samples preparation, whose setup is yet in progress and will be the argument of a separate work. The g-ray spectrometer was calibrated by means of IAEA Reference Materials n. 312, 313, 314 and 375. A large difference from the predictions of secular equilibrium emerged between the activities of 234Th and 230Th in Materials n. 312, 313 and 314.