Radial dose distribution and effective delta ray radius (Penumbra radius): Determination for some ions passing through water

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

卷:462

Article

Awad, E. M.¹  Abu-Shady, M.² 

[1] Menoufia Univ, Phys Dept, Fac Sci, Menoufia 32511, Egypt

[2] Menoufia Univ, Math & Comp Sci Dept, Fac Sci, Menoufia 32511, Egypt

关键词: Radial dose;    Penumbra radius;    Effective delta-ray range;    Heavy ions;    Bragg peak;    LET;   

DOI  :  10.1016/j.nimb.2019.10.031

来源: Elsevier

【 摘 要 】

An analytical equation for calculating radial dose of heavy ions in water is introduced by Awad et al. (Applied Radiation and Isotopes, 142 (2018) 135-142). It is simple alternative to Monte Carlo code and is a promising equation, however, still needs refinement. Refinement was added through adjusting radial dose integration upper limit which gives the effective delta-ray range, r(max) and ion's penumbra radius in water as well. Radial dose distributions for 85 ions forming fifteen energy groups from 0.25 to 24 MeV/n were studied. By employing the effective delta-ray range, it was possible to get more consistent radial dose distribution in comparison to experimental and Monte Carlo simulation data. The corresponding LET values of those ions were estimated and compared with SKIM program. Penumbra radii for 85 ions were determined. Good description for the penumbra radii was obtained using a proposed new equation which fits experimental data as well.

【 授权许可】

Free