The mass attenuation coefficient , effective effective atomic number Zeff and the corresponding effective electron density Nel of thermoluminacent material (KBr) has been calculated in the extended energy region from 1 KeV – 100 GeV using WinXCom program. In total photon interaction with coherent and incoherent one can distinguish three energy regions are approximetly E<0.01MeV, 0.05MeV<E<5MeV and E>200MeV. Hence Zeff and Nel are nearly constant. The main photon interaction processes in these regions are photoelectric absorption, incoherent (Compton) scattering and pair production. The maximum values of Zeff and Nel are found in the low energy range, where photoelectric absorption is the main interaction process. The minimum values of Zeffand Nel are found at intermediate energies, where Compton scattering is dominant. At high energies Zeff and Nel remains almost constant. This may be due to the dominance of pair production in the high energy region in that energy region, such as photoelectric absorption, Compton scattering and pair creation.

Effective atomic number, electron density, mass attenuation coefficient, WinXCom