The physics process of γ-detection of γ-spcctrometer with Compton suppression shields has been simulated using Monte-Carlo method. The results calculated for the γ-source ¹³⁷Cs with energy of 662 keV and for the cascade γ-source ⁶⁰Co with energies of 1173 keV and 1332 keV were in agreement with measurements. This work should be useful in the physics design, for γ-spectrometers with Compton suppression shields.

In this article, the attenuation of broad beam of γ-ray passing through a medium has been researched with Monte-Carlo method and it was pointed out that the beam obeys the exponential rule if an equivalent absorption coefficient is used. A new idea of design forγ-ray thicknessmeter was then advanced for weakening radiation intensity, increasing count, and improving measurement precision. An absorption experiment of broad beam of γ-ray with energy of 60 keV in aluminium has been done and the result agrees with Monte-Carlo calculation.