Resumo

ESCARENO-JUAREZ, E.  e  VEGA-CARRILLO, H.R.. ⁴⁰K measurement to determine the total potassium content. Rev. mex. fis. [online]. 2012, vol.58, n.3, pp.211-214. ISSN 0035-001X.

Total potassium concentration has been determined measuring the 1461 keV gamma-rays emitted during the ⁴⁰K decay. Using KC1 salt set of ⁴⁰K sources were prepared as standards and were used to characterize a NaI(T1) γ-ray spectrometer. To test the procedure two unknown sources were used, for these ⁴⁰K mass were determined as well as the specific activity. The rate of change between the mass of K and the net count rate under the 1461 keV photopeak is constant, allowing determining the mass of K measuring the γ-ray emitted during ⁴⁰K decay. Specific activity was approximately 31 Bq/g being consistent with values reported in literature.

Palavras-chave : ⁴⁰K standards; γ-ray spectrometry; K content.

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