E. Vapirev, P. Grozev, N. Krasteva, T. Jordanov, M. Serezlieva, S. Amin
University of Sofia, Faculty of Physics, 1164 Sofia, Bulgaria

Abstract. Experiments have been performed for qualitative determination of the effect of geometry of the experiment on beta-ray absorption coefficients. It has been demonstrated that the reduction in a number of the beta-particles transmitted through absorbers is due mainly to the process of deflection from the initial direction. The influence of the geometry has been investigated for a ⁹⁰Sr(Y) source with a stilbene crystal and for a ¹⁴⁷Pm source with a silicon avalanche diode. An empirical relation for the number of beta-particles transmitted through an absorber which accounts for the geometry and the contribution of scattered electrons has been tested. The energy transfer for transmission and scattering has also been measured.

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