The mass attenuation coefficients, effective atomic numbers and effective electron densities for GAGG:Ce and CaMoO₄ scintillators

In this study, the mass attenuation coefficient (μ_m), the effective atomic number (Z_eff) and the effective electron density (N_eff) of Gd₃Al₂Ga₃O₁₂:Ce (GAGG) and CaMoO₄ scintillators were measured at different gamma ray energies. The samples were irradiated with eight different photon energies using Compton scattering technique. The scattered photons from ¹³⁷Cs source were detected by NaI(Tl) scintillation detector in an ordinary counting system. The experimental results were compared with the theoretical (WinXcom) values. The results show that the experimental values ofμ_m, Z_eff and N_eff of GAGG are higher than those of CaMoO₄ and all values are in good agreement with the theoretical ones. The values ofμ_m, Z_eff and N_eff increased toward the decrease of gamma ray energies. The partial interactions of the crystals were also investigated.