Development of calculation code for physical phenomenon elucidation on the way from physical to chaemical processes in particle irradiation

2017 Fiscal Year Final Research Report

• Project/Area Number: 25390131
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Quantum beam science
• Research Institution: National Institutes for Quantum and Radiological Science and Technology (2016-2017); Japan Atomic Energy Agency (2013-2015)
• Principal Investigator: MORIBAYASHI Kengo 国立研究開発法人量子科学技術研究開発機構, 関西光科学研究所 量子生命科学研究部, 上席研究員(定常) (70354975)
• Project Period (FY): 2013-04-01 – 2018-03-31
• Keywords: 重イオンビーム / シミュレーション / 二次電子の運動 / 動径線量 / トラックポテンシャル

Outline of Final Research Achievements

We executed a simulation study for the motion of secondary electrons in the irradiation of a heavy particle into a cell (main component is water). We incorporate the track potential affecting the motion of secondary electrons near the incident particle path into simulations. Here, the track potential is produced from the electric field of molecular ions created from this irradiation. In the motion of secondary electrons, we succeeded to derive a simple equation as a function of ion impact ionization cross sections for the probability of secondary electrons escaping the track potential. This probability agrees well with the trend of measurement data. Further, by considering this effect of the track potential, we also succeeded to develop new distributions for radial dose, which is the dose as a function of the distance from the heavy particle path. The distribution developed here shows larger dose than that in the conventional distribution near the incident particle path.

Free Research Field

重イオンビーム科学