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Development of a PHITS simulation technique and a numerical method to optimize measures against radioactive sources

Furutachi, Naoya*; Yoshida, Toru*; Yanagi, Hideaki*; Hasegawa, Yukihiro*; Machida, Masahiko  

We developed a system called 3D-ADRES-Indoor for evaluating radiation doses in indoor environments, focusing on estimating radioactive source distributions using machine learning and planning measures against these sources. The system utilizes the Particle and Heavy Ion Transport code System (PHITS) for dose rate calculations. We introduced a simulation technique and a numerical method to improve planning efficiency. By decomposing dose rates and using specific models, our technique significantly reduces computational times compared to normal simulations. We incorporated four measures against radioactive sources: decontamination, removal, relocation, and shielding. For decontamination, we optimized rates for each source to achieve target doses at minimum cost using Particle Swarm Optimization. Users can set these measures through a user-friendly interface, enabling various simulations and enhancing planning flexibility in 3D-ADRES-Indoor.

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