A study of energy absorption and exposure buildup factors in natural uranium

Salehi, Danial; Sardari, Dariush; Jozani,

doi:10.12989/amr.2015.4.1.23

Cited by 17 publications

(1 citation statement)

References 15 publications

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“…The exposure buildup factor (EBF) stands for exposure in air after penetration through the absorber or shielding material. Since a primary assessment in radiation protection is the exposure field before and after use of a radiation shield, EBFs are of more general use with appropriate adjustments of the air exposure to obtain absorbed dose [13]. The buildup factor values have been computed by various codes such as Geometric Progression (GP) method [14], iterative method [15], invariant embedding method [16,17] and Monte Carlo method [18].…”

Section: Introductionmentioning

confidence: 99%

Study of gamma radiation shielding properties of $$\mathbf{ZnO {-}{} \mathbf TeO }_\mathbf{2}$$ ZnO - T eO 2

2017

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Mass attenuation coefficient (μ m), half value layer (HVL) and mean free path (MFP) for xZnO−(100−x) TeO 2 , where x = 10, 15, 20, 25, 30, 35 and 40 mol%, have been measured for 0.662, 1.173 and 1.33 MeV photons emitted from 137 Cs and 60 Co using a 3 × 3 inch NaI(Tl) detector. Some relevant parameters such as effective atomic numbers (Z eff) and electron densities (N el) of glass samples have been also calculated in the photon energy range of 0.015-15 MeV. Moreover, gamma-ray energy absorption buildup factor (EABF) and exposure buildup factor (EBF) were estimated using a five-parameter Geometric Progression (GP) fitting approximation, for penetration depths up to 40 MFP and in the energy range 0.015-15 MeV. The measured mass attenuation coefficients were found to agree satisfactorily with the theoretical values obtained through WinXcom. Effective atomic numbers (Z eff) and electron densities (N el) were found to be the highest for 40ZnO−60TeO 2 glass in the energy range 0.04-0.2 MeV. The 10ZnO−90TeO 2 glass sample has lower values of gamma-ray EBFs in the intermediate energy region. The reported new data on radiation shielding characteristics of zinc tellurite glasses should be beneficial from the point of proper gamma shield designs when intended to be used as radiation shields.

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