Chemical composition dependence of exposure buildup factors for some polymers

A comprehensive study on energy absorption and exposure buildup factors for some essential amino acids, fatty acids and carbohydrates in the energy range 0.015–15MeV up to 40 mean free path

“…For lower penetration depths, these particles may escape from the material or after multiple collisions within the material comes to rest and further annihilates. With the increase in penetration depth, these secondary gamma rays (as a result of annihilation) contribute to the rise in intensity of the primary gamma rays [24].…”

Gamma-ray energy buildup factor calculations and shielding effects of some Jordanian building structures

“…The obtained Z eq values of the selected materials were then used to interpolate G.P. fitting parameters (a, b, c, d and K χ ) in the energy range 0.05-3 MeV, using the following interpolation formula (Harima, 1983;Singh et al, 2009 …”

A Comprehensive Study on Energy Absorption and Exposure Buildup Factors for some Soils and Ceramic Materials

“…The reason behind the pair production process starts pre-dominating and results with an electron-positron pair for lower penetration depth, these particles may escape from the material or after multiple collisions with in the material comes to rest and further annihilates. With the increase in penetration depth, these secondary gamma rays (as a result of annihilation) contribute to the rise in intensity of the primary gamma rays [19].…”