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Tsuda, Shuichi; Sato, Tatsuhiko; Ogawa, Tatsuhiko
Radiation Protection Dosimetry, 168(2), p.190 - 196, 2016/02
Times Cited Count：2 Percentile：19.57(Environmental Sciences)Deposit energy distribution in microscopic site in a living cell is important information for understanding of biological effects of energetic heavy ion beams. In this work, a wall-less tissue equivalent proportional counter has been used for the measurement of lineal energy (y) distributions and dose-mean of y (yD) at radial direction of 30 MeV H at TIARA, for the verification of the microdosimetric function of PHITS. The measured yf(y) summed in radial direction agree with the corresponding data from the microdosimetric calculations using the PHITS code fairly well. The yD of 30 MeV proton beam presents the smallest value at r = 0.0 and gradually increase with radial distance, while the values of heavy ions such as iron showed rapid decrease with radial distance. This experimental result demonstrates that the stochastic deposit energy distribution of high-energy protons in microscopic region is rather constant both in the core and in the penumbra region of the track structure.
Tsuda, Shuichi; Sato, Tatsuhiko; Ogawa, Tatsuhiko
no journal, ,
Energy deposition in and around ion beam is fundamental and important information when evaluating biological effect of ion beams based on dose contribution. Using a wall-less tissue-equivalent proportional counter, we measured the radial dependence of the lineal energy distribution, yf(y), of 30 MeV proton beam. The yf(y) distributions and the dose-mean of y for various kinds of energetic ion beams have been are measured and compared with calculations performed with the microdosimetric function of the Particle and Heavy Ion Transport code System (PHITS). To proceed the improvement of the PHITS code, the contribution of incident ions and the secondaries was investigated using narrow ion beam and the wall-less TEPC. Measured yf(y) and dose-mean of yf(y) for 30 MeV proton beam will be reported, as well as the calculated results using PHITS and the result of the dose contribution by the incident proton beam.
