Resumen

CORONEL C., Edgar A.. QUENCHING OF CERENKOV RADIATION FROM NATURALLY OCCURRING ⁴⁰K BY DYES AS PHOTOMETRIC TECHNIQUE. Rev. Bol. Quim [online]. 2012, vol.29, n.1, pp.80-86. ISSN 0250-5460.

ABSTRACT The beta emitter ⁴⁰K isotope contained in KCl solutions, produces photons known as Cerenkov radiation measurable by liquid scintillation spectrometry. A set of dyestuffs and metal ion complexes showed quenching effects against Cerenkov light. Studied systems follow the Stern-Volmer equation. Counting ratiosvs. quencher concentration [Q], are linear, yielding K_s._v constants. High K_s._v values indicate highly quenched systems. Congo red and Methylene blue havevalues 20.0xl0⁴ M"¹ and 2.27xl0⁴ M"¹ respectively. Crystal violet does not act as quenching agent in the range up to O.lrnM, and has a lowestvalue, about 10"⁴ M"¹. There are linear correlations between visible absorbances atand counting ratios Neither inorganic colorless salts as lead nitrate or zinc nitrate, nor pure solvents as acetonitrile, acetone, methanol and ethyl acetate showed quenching properties. As a result, a procedure suitable for dyestuff determinations based on quenching of Cerenkov radiation has been accomplished.

Palabras clave : Cerenkov radiation; Dyestuffs; Natural radioactivity; Liquid scintillation; Nuclear methods.

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