QUENCHING OF CERENKOV RADIATION FROM NATURALLY OCCURRING 40K BY DYES AS PHOTOMETRIC TECHNIQUE

Coronel C., Edgar A.

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Revista Boliviana de Química

On-line version ISSN 0250-5460

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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 ratios $Descripción: C:\SciELO\serial\rbq\v29n1\img\revistas\rbq\v29n1\v29n1a08-1.jpg$ vs. quencher concentration [Q], are linear, yielding K_s._v constants. High K_s._v values indicate highly quenched systems. Congo red and Methylene blue have $Descripción: C:\SciELO\serial\rbq\v29n1\img\revistas\rbq\v29n1\v29n1a08-2.jpg$ values 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 lowest $Descripción: C:\SciELO\serial\rbq\v29n1\img\revistas\rbq\v29n1\v29n1a08-3.jpg$ value, about 10"⁴ M"¹. There are linear correlations between visible absorbances at $Descripción: C:\SciELO\serial\rbq\v29n1\img\revistas\rbq\v29n1\v29n1a08-4.jpg$ and counting ratios $Descripción: C:\SciELO\serial\rbq\v29n1\img\revistas\rbq\v29n1\v29n1a08-5.jpg$ 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.