Keywords : attenuation coefficient


Simulation of the Gamma Absorption by Lead Bronze Alloys Using Geant4

Hilala N. Mohammed; Ali H. Taqi; Abdulahdi M. Ghalib

Rafidain Journal of Science, 2021, Volume 30, Issue 2, Pages 1-10
DOI: 10.33899/rjs.2021.168338

Shielding materials are extremely important in production or handling isotopes, nuclear reactors, accelerators, and medical centers, etc. The Monte Carlo simulation code Geant4 is one of the most important and common platforms for the simulation of the interaction of radiation with matter. Therefore, this paper is devoted to simulating the partial absorption of the gamma-ray by Lead bronze alloys                  (Pb, Sn, Cu) in different proportions using the Monte Carlo simulation code Geant4 from 1.5 keV to 15 MeV. The accuracy of the simulated results of the total and partial mass attenuation coefficients () for the photoelectric effect, Compton Scattering and pair production, and tenth value layers (TVL) were evaluated by using the XCOM program. The agreements were good, but it depends on the energy of the incident photon. The mass attenuation coefficients decreased when the photon energy increased and many peaks are observed. The effect of adding Pb was clear, as the  increases while the TVL decreases.

Simulation of the Gamma Attenuation through Borate Glass Using Genat4

Shlair I. Mohammed; Ali H. Taqi; Abdulahdi M. Ghalib

Rafidain Journal of Science, 2021, Volume 30, Issue 2, Pages 11-22
DOI: 10.33899/rjs.2021.168339

In this study, the protection parameters of the gamma-ray of Borate glass system containing 10Li2O. 10K2O. 20Na2O. xPbO.                   (60-x) B2O3 where x to be varied as 0, 10, 20, 30, 40, 50 and 60, were investigated using the Monte Carlo simulation code Geant4. The coefficients of attenuation were calculated using the Monte Carlo simulation code Geant4 as a function of the incident photon 0.0015 MeV and 15 MeV. The accuracy of the simulated results was tested by using the XCOM program. The Geant4 and XCOM results showed a reasonable agreement. The results of the attenuation parameters showed that the sample of higher PbO concentration absorbs a greater number of photons, therefore the attenuation coefficients are increased while the tenth-value layer (TVL) values are decreased due to the increase in PbO from 0 to 60%. The linear and mass attenuation coefficients decreased when the photon energy increase and many peaks are observed.