Effect of different arrangements of point source,aluminum absorber and detector on mass absorption coefficient of beta-particles

Summary The transmission of 0.766 MeV beta-particles emitted from ²⁰⁴Tl through aluminum has been investigated for different arrangements of point source, absorber and detector. In the first arrangement, the mass absorption coefficient (μ_m) has been measured as a function of the absorber to the source distance (H_AS), when the absorber foil was placed just above the window of a surface barrier solid state detector. In the second arrangement, the mass absorption coefficient has been measured as a function of the absorber to detector distance (H_AD), when the absorber foil was placed just on the source. The measured mass absorption coefficients of beta-particles have been compared to the values gained in a previous work.