Variation of energy absorption and exposure buildup factors with incident photon energy and penetration depth for boro-tellurite (B2O3-TeO2) glasses

The gamma ray energy absorption (EABF) and exposure buildup factors (EBF) of (100-x)TeO2-xB(2)O(3) glass systems (where x=5, 10, 15, 20, 22.5 and 25 mol%) have been calculated in the energy region 0:01515 MeV up to a penetration depth of 40 mfp (mean free path). The five parameters (G-P) fitting method has been used to estimate both EABF and EBF values. Variations of EABF and EBF with incident photon energy and penetration depth have been studied. It was found that EABF and EBF values were higher in the intermediate energy region, for all the glass systems. Furthermore, boro-tellurite glass with 5 mol% B2O3, was found to present the lowest EABF and EBF values, hence it is superior gamma-ray shielding material. The results indicate that the boro-tellurite glasses can be used as radiation shielding materials. (C) 2016 Elsevier Ltd. All rights reserved.