Astronaut dose estimation using the PHITS code in combination with realistic models of the Kibo module and the MATROSHKA phantom

Sato, Tatsuhiko   ; Nagamatsu, Aiko*; Takeda, Kazuo*; Niita, Koji*; Puchalska, M.*; Sihver, L.*; Reitz, G.*

Estimation of organ doses and their mean quality factors for astronauts due to cosmic-ray exposure has been an essential issue in the planning of long-term space missions. We therefore performed simulation for calculating the organ doses and their mean quality factors inside the MATROSHKA phantom, using a realistic geometry of the Kibo module in combination with the NUNDO phantom, which was constructed based on the CT image of the phantom. The particle and heavy ion transport code system PHITS was employed in the simulation. From preliminary results, it is found that the calculated organ doses and their mean quality factors inside the MATROSHKA phantom agree with the corresponding experimental data fairly well.