Abstract
Effective atomic number for photon energy absorption (Z peaeff ), the relative effective atomic number of the thermoluminescent dosimetric (TLD) materials with respect to air (Z reff ), and energy dependence (ED) of the TLD materials such as beryllium oxide (BeO), lithium tetraborate (Li 2 B 4 O 7 : Cu, Ag, P), aluminum oxide (Al 2 O 3 ), calcium fluoride (CaF 2 ), and titanium oxide (TiO 2 ) in the energy range of 1 keV to 20 MeV have been studied. The values of ZPEA eff and ZR eff show a broad peak and a maximum value around 20 keV for BeO, around 60 keV for CaF2 and TiO 2 , and around 40 keV for Al 2 O3 and Li 2 B 4 O 7 : Cu, Ag, P. Overall, the effective atomic number (Z eff ) varies linearly with ED for all the materials in the photon energy range of 1 keV to 20 MeV except TiO2 and thereby confirming the validity of a more commonly employed method of using the Z eff to calculate the measure of the ED in TLD. The ED values show a broad peak around 30 keV for CaF 2 and TiO 2 and around 20 keV for Al 2 O 3 and remain almost constant for the other two materials.
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