| Budget Amount *help |
¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2013: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
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| 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.
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