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Measurement of lineal energy distributions for ion beams using a wall-less tissue equivalent proportional counter

Tsuda, Shuichi  ; Sato, Tatsuhiko  ; Ogawa, Tatsuhiko 

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 $$y$$ ($$overline{y}$$$$_{D}$$) 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 $$overline{y}$$$$_{D}$$ 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.

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