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A simple dose calculation tool, SiDE, was developed for dose evaluation in a water phantom for boron neutron capture therapy, which shortens the calculation time much more than the conventional particle transportation Monte Carlo codes and is applicable to any type of incident neutron spectra to the phantom. As the SiDE can not only calculate quantitatively the dose distribution in the phantom but also output dose indexes such as advantage depth and peak tumor dose, comparison between different boron neutron capture therapy neutron sources can be easily performed. Consistency with a Monte Carlo transportation code was verified through comparison with the conventional dose calculation with the Particle and Heavy Ion Transport Code System, and the calculation time was nearly 1/90 in the SiDE. The dose distributions for a reactor and accelerator-based neutron sources were compared, and the differences were found to be small although large differences between the incident spectra.

Japanese sword is well known as a strong and sharp weapon and has a long history of more than 1000 years. The making process have not been well known especially for old swords (Koto) before Edo era since there were no written documents. Crystallographic or metallurgical characteristics are useful to understand the swords characteristics and consider the making process. However, studies to obtain such information have been not so easy since proper non-invasive methods were not popular. Neutron diffraction and imaging are powerful tool, and Bragg edge transmission imaging is a unique tool to obtain crystallographic information over a large area. Here, we introduce neutron methods and information obtained, and studies about Japanese swords.

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