Title: ABSOLUTE HIGH ACCURACY COUNTING OF ALPHA PARTICLES IN THE PRESENCE OF BETA RADIATION
Abstract: The determination of the disintegration rate of samples of pure alpha emitters by liquid scintillation counting can be done with accuracies of ± 0.1% or better, if source preparation and counting are performed carefully. For mixed alpha- and beta emitters—as it is the case for several uranium isotopes in equilibrium with their daughter products—direct separation of alpha- and beta activity by simple spectroscopy is not possible due to the high ratio, R(α/β), of alpha to electron energies giving equal pulse heights. By proper calculation and subtraction of the competing beta contribution in the counting rates at different cut-off energies and by extrapolation to zero energy, however, the alpha activity can be determined with nearly the same accuracy. Using experimental R(α/β) values for the beta-energy calibration the beta contribution is calculated from the theoretical beta spectrum corrected for wall effects and resolution.
Publication Year: 1971
Publication Date: 1971-01-01
Language: en
Type: book-chapter
Indexed In: ['crossref']
Access and Citation
Cited By Count: 4
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