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Determination of Radium-226 in Rock Samples by Liquid Scintillation Counter

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Document pages: 15 pages

Abstract: Thepresent work examines the validity of using barium as a carrier for radium-226 determination and optimizes the amountadded during the radiochemical separation from rock samples. The activityconcentration of Ra-226 is determined in rock samples by liquid scintillationspectrometer via its short-lived daughters after the radiochemical separation.The activity of Ra-226 was calculated based on the countsmeasured in a window set for Po-214 peak. The activity measured by LiquidScintillation Counter, LSC using Pulse Shape Analysis, PSA. Ba-133 wasused for chemical yield. The applied method was tested using a CertifiedReference Material, CRM ore number-Dl-1a which shows a good agreement with thecertified values. The applied method for measuring Ra-226 has been adapted tobe used in rocks such as monazite. The average activity for Ra-226 in rocksamples collected from the commercial grade Egyptian monazite was 13.85 ± 2.05Bq g with a detection limit 9.58 mBq g. The optimum conditions have beenestablished during the present work such as precision, cost and timepreparation which makes the method useful for radio chemists and the decisionmakers.

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