Monte Carlo simulation of the passage of γ-rays and α-particles in CsI

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:490

Article

Xie, YuLong¹  Campbell, Luke W.¹  Prange, Micah P.¹  Gao, Fei²  Kerisit, Sebastien¹ 

[1] Pacific Northwest Natl Lab, Richland, WA 99354 USA

[2] Univ Michigan, Dept Nucl Engn & Radiol Sci, Ann Arbor, MI 48109 USA

关键词: Radiation detection materials;    gamma-Ray spectroscopy;    Particle discrimination;    Nuclear collisions;   

DOI  :  10.1016/j.nimb.2020.12.018

来源: Elsevier

【 摘 要 】

Theoretical and computational methods for simulating the creation of ionization tracks by fast ions in solids were applied to the passage of alpha-particles in CsI, an inorganic scintillator commonly used for radiation detection. The methods were implemented in a Monte Carlo program to simulate the interaction of alpha-particles, with incident energies of up to 1 MeV, with CsI. The simulations followed the fate of individual electron-hole pairs and included the formation of Frenkel pairs and thus allowed for a detailed description of the microscopic structure of ionization and defect tracks created by incident radiation. Simulations were also performed with gamma-rays of the same energy to compare and contrast the ionization tracks obtained with both types of particles. Intrinsic properties such as the mean energy per electron-hole pair, Fano factor, maximum theoretical light yield, and spatial distributions of electron-hole pairs were computed for both alpha-particles and gamma-rays. alpha-Particles created cylindrical tracks that were initially aligned with the incident direction and with initial radii of a few tens of nanometers, whereas gamma-rays showed significant scattering, resulting in probability distributions with lower intensities and much greater radial extents.

【 授权许可】

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