Fundamental study of earliest stage of water radiolysis by low energy electrons

Kai, Takeshi   

Particle transport codes such as PHITS can calculate energy deposition in living system, however, it is impossible to analyze radiation interaction in nano-scale because the codes cannot simulate microscopic behavior of low energy electrons. We have developed a simulation code which can simulate the behavior. In this presentation, we explain the calculation methods of electron collision cross section as well as the electron behavior in water. We also show the results for a primary electron transport and secondary electrons deceleration. From the results, we perform DNA damage prediction involved in the low energy electrons. We found novel complex DNA damage mechanism which induces radiation biological effect such as cell death or mutation. We also present an implementation of the code into PHITS and future plans for the functional extension of PHITS.