Liquid scintillation spectrometry process and apparatus

Details Liquid scintillation spectrometry process and apparatus Liquid scintillation spectrometry process and apparatus

1978-03-24

1980-02-05

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

With or including a luminophor

250252, 250328, G01T 120

Patent

active

041874269

ABSTRACT:
The invention relates to a liquid scintillation spectrometry process and apparatus permitting the analysis of samples having a quenching of the fluorescent efficiency resulting both from a color quenching and a chemical quenching. The invention makes it possible to measure a parameter B which gives the respective contributions of the two quenching types. According to the invention, parameter B is obtained in the following manner. A scintillation radiation produced by a standard fluorescent source placed in the vicinity of the sample to be measured is passed through the latter. This source comprises, for example, a solid scintillator exposed to an alpha or beta radiation source. The scintillation emitted by the standard source supplies an amplitude spectrum which is measured. One of the significant characteristics of this spectrum is determined, for example, the ratio of the counting rates in two different channels. This ratio gives parameter B. With respect to the parameter determining the overall quenching of the sample G, it is determined as in per se known methods by using a standard gamma source and the ratio of the counting rates in the two channels of different energies is then measured. The knowledge of the two parameters B and G makes it possible to accurately determine the fluorescent efficiency and consequently correct the spectrometers.

REFERENCES:
patent: 4085325 (1978-04-01), Atallah et al.

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