Determination of 90Sr by measuring 90Y Cerenkov Counting
Office of Atoms for Peace, Bureau of Technical Support for Safety and Regulation, 10900 Bangkok, Thailand
a Corresponding author : firstname.lastname@example.org
To determine 90Sr activity in environmental samples advanced cerenkov counting using liquid scintillation counter has been widely investigated. Separated 90Y in equilibrium with 90Sr in a solution can be counted using a Cerenkov measurement without scintillation. In addition an equilibrium 90Sr/90Y in a solution can be directly measured using 90Y Cerenkov counting. The 90Sr Cerenkov counting is considered negligible due to its very low counting efficiency. In this work the Cerenkov technique to measure 90Y counting from a series of 90Sr/90Y solution was studied in the two matrices, 16 mL of 1 M HNO3 and 0.1 M HCl. A suitable counting window was found to be in the range of 0–50 keV. Cerenkov counting in the HNO3 solution obtained a lower background count rate (2.2 CPM) than those of the HCl solution (3.32 CPM). 90Y counting efficiencies of the HNO3 solution (between 56.73 and 64.61%) were slightly lower than those of HCl solution (between 45.19 and 66.34%). However, FOMs of the HNO3 (between 1418 and 1839) were much higher than those of HCl (between 615 and 1326). In this case the HNO3 solution is a better matrix for the Cerenkov counting of 90Y.
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