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Ionic liquids as solvents for Čerenkov counting and the effect of a wavelength shifter
M Mirenda1, D Rodrigues1, C Ferreyra2
1Comisión Nacional de Energía Atómica (CNEA), CONICET, Gerencia Química, Centro Atómico Constituyentes, Av. Gral. Paz 1499, San Martín, B1650KNA Buenos Aires, Argentina.
Abstract:
We study the wavelength shift of the Čerenkov light - generated in the ionic liquid (BMIMCl) - caused by the addition of the highly fluorescent ionic liquid (BMIMHPTS). 18F and 32P efficiencies increases up to 124% and 14%, respectively, compared with the values obtained with pure BMIMCl. With this improvement, ionic liquid mixtures become a good alternative - when using the TDCR-Cherenkov technique - to standardize radionuclides having electron emissions energies close to the threshold energy in water (∼ 260keV). As an advantage compared with other solvents, the Ionic liquid mixture can be reused, in the case of short-lived radionuclides, by simply removing all water content in a vacuum oven.
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