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Additional resources for A Handbook of Radioactivity Measurements Procedures: With Nuclear Data for Some Biomedically Important Radionuclides

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It is evident that all good solvents have an aromatic structure. Dioxane is included in the table because of its significance as a solvent for water and aqueous solutions. Dioxane alone has a low relative scintillation efficiency, but with the addition of naphthalene the efficiency becomes comparable with that of benzene. Many scintillation liquids contain an additional component generally referred to as a secondary solute, or secondary scintillator. The secondary scintillator was originally used to match the spectral response of the phototube to that of the light emitted by the scintillator.

Keu Fig. 9. 5 atmospheres in xenon). , when a photon has sufficient energy to remove an electron from the K shell. ) 30 / 2. PHYSICS OF SOME RADIATION DETECTORS voltage is such that nearly all primary events are counted, a plot of counting rate against applied voltage becomes nearly horizontal, and the flatness of the curve in this region, the plateau, is a measure of the ability of the counter to detect essentially all primary ionizing events. Any further increase in voltage will cause only a small increase in counting rate.

Thus the first three terms in F are dependent upon the choice of scintillator while m depends on the scintillator-phototube combination. Values for some of these parameters are given in Table 6. Examples of the use of the "scintillation figure of merit" are given in Birks (1975). Table 5 shows solvent scintillation efficiencies relative to that of toluene. It is evident that all good solvents have an aromatic structure. Dioxane is included in the table because of its significance as a solvent for water and aqueous solutions.

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