Semi-empirical relationship for photon buildup factor in soft tissue and water

Abstract

Buildup factor of gamma and X-ray photons in the energy range of 0.2-2 MeV in water and soft tissue is computed using Monte Carlo code MCNP4C. The results are compared with the buildup factor data of pure water. A new relationship estimating buildup factor as a function of penetration depth, Compton scattering and energy absorption cross sections is introduced. The new relationship estimates buildup factor with 5 % deviation compared with the existing data.

A Proposed Simple Model for Estimating Occupational Radiation Dose to Staff from Veterinary 18F-FDG Pet Procedures

“…For these calculations, soft tissue is assumed equivalent to water (r = 1 g cm j3 ) because data on buildup factors in soft tissue are extremely limited (Sardari and Baradaran 2010). The linear attenuation coefficient for 511 keV photons in water is 0.097 cm j1 (Hubbell and Seltzer 1996).…”

Semi-empirical relationship for the energy absorption buildup factor in some biological samples

“…For de tailed ex pla na tions on the semi-em pir i cal re la tion and mi cro scopic cross-sec tions of H, C, O, and N used in this study, we may re fer to the pre vi ous study in which the use of a semi em pir i cal re la tion is ex plained in de tail [12].…”

“…Re cently, Sardari and Baradaran [12] de veloped a new re la tion ship es ti mat ing the buildup fac tor as a func tion of pen e tra tion depth, Compton scat ter -ing, and en ergy ab sorp tion cross-sec tions. In an other work Sardari and Kurudirek [13] de vel oped this semi em pir i cal equa tion ap proach to the data ob tained through a five pa ram e ter GP fit ting method to the EABF for soft tis sue, wa ter, and hy dro gen, car bon, nitro gen and ox y gen based dosimetric ma te ri als.…”

Investigation of some radiation shielding parameters in soft tissue

“…The mass attenuation coefficient, m/r, and the mass energyeabsorption coefficient, m en /r, are basic quantities used in calculations of the penetration and the energy deposition by photons (x-ray, g-ray, bremsstrahlung) in biological, shielding and other materials (Hubbell & Seltzer, 1995). On the other hand buildup factor is an important parameter in predicting and estimating the distribution of photon flux in irradiated object and calculation of radiation dose received by the biological molecules (Chilton, Shultis, & Faw, 1984;Sardari and Baradaran, 2010;Sardari, Abbaspour, Baradaran, Babapour, 2009). The buildup factors define in two terms: exposure in the air after penetration through the absorber or shielding material that called the "Exposure Buildup factor" (EBF).…”