Cryptic “photon” quenching in dioxane-based liquid scintillation mixtures
✍ Scribed by Helmut Wombacher; Monika Reuter-Smerdka
- Publisher
- Elsevier Science
- Year
- 1976
- Tongue
- English
- Weight
- 678 KB
- Volume
- 74
- Category
- Article
- ISSN
- 0003-2697
No coin nor oath required. For personal study only.
✦ Synopsis
Dioxane-based scintillation mixtures containing P-emitting radioisotopes show a decreased efficiency under the following conditions: low water concentration in the sample, the presence of some metal ions, e.g., Ca*+, Mg2+, and certain SH-and 14C-labeled compounds, e.g., nucleotides. If only one of the preconditions was not fulfilled, the effect disappeared. There is no visible sign of any form of sample inhomogeneity, and the composition of the scintillation sample gives no reason to suppose that a special sort of quenching would occur. In addition, no commonly used standardization method, such as external standard channels ratio, internal standard, or sample channels ratio could be used to detect this sort of quenching, to say nothing of correcting for it. A further analysis shows that the decreased count rate has to be explained by a special sort of "photon" quenching. The so-called "double ratio plot" proposed by Bush ((1968) Int. J. Appl. Radiat. Isotop.
19, 447-452) to provide an indication of sample heterogeneity failed to indicate this sort of photon quenching. 526