Calibration of gross alpha measurement using liquid scintillation counting and estimation of total uncertaintyAim of the studyThe objective of the research was to calibrate various liquid scintillation counters (Quantulus 1220 and Guardian 1414) for gross alpha measurement using different solvents for sample dissolution, liquid scintillation cocktails and matrices. ImplementationThree Quantulus 1220 and two Guardian 1414 counters were calibrated for gross alpha measurement. The efficiency and the PSA level were determined using the Ultima Gold AB liquid scintillation cocktail. Two different solvents, 1M HCl and 1M HNO3, were used for sample dissolution. The examined matrices were drinking water, urine and swipe samples. The total uncertainty was estimated based on the international standard. Dissemination and exploitation of the resultsThe results are utilised in the measurement services, in the research projects carried out at STUK and in the emergency preparedness. In case of emergency preparedness, the existing calibrations are important, especially for urine samples, since internal exposure is estimated from urine samples. On the basis of the results a scientific article is written. CollaboratorsNo other collaborators outside the STUK. Timetable2006–2009 Responsible scientistPia Vesterbacka Page updated 17/05/2009
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