Abstract
Beta dose-rates (BDR) have been derived from tephras, pumices and pottery of archaeological origin. The BDRs were obtained from two counting systems: (1) gamma spectrometry through appropriate conversion of gamma activity to U, Th, 40K concentration values, and (2) by counting total beta, using a gas-flow sample detector in an anticoincidence mode of counting. Assuming radioactive equilibrium in the U and Th series, the two methods of obtaining BDRs are compared. The degree of disequilibrium, the calibration, and radon escape will be critically considered. The employment of either methods to swift BDR measurements for the TL dating will be discussed. The radioactivity measurements of tephras were used also to provenance those, as Santorini volcano might had not been the only eruption in the Aegean in the 2nd mill. B.C., it might have experienced more than one eruptive phase. BDRs in the samples ranged from 13 to about 470 mrads/year and the agreement between the two methods were in general satisfactory.
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