عنوان مقاله [English]
نویسندگان [English]چکیده [English]
An improved method for measurment of 90Sr was based on Tributylphosphate (TBP) extraction of the radio-Yttrium and oxalate precipitation to remove bulk Potassium. The Cerenkov radiation produced by the high energy beta emission of 90Y was measured with 1220 Quantulus liquid scintillation spectrometer. The minimum detectable concentration (MDC) was 0.0053 Bq for 180 minute and 95% confidence level 90Sr activity concentration in mineral samples was from 0.0192 to 0.193 Bq.
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