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Computational performance evaluation of a new omni-directional radiation imaging system using fractal-shaped radiation detectors

Sasaki, Miyuki  ; Sanada, Yukihisa   ; Torii, Tatsuo*  ; Yoshino, Masano*; Yoshikawa, Akira*

The purpose of this study is to develop an inexpensive and simple omni-directional radiation imaging system using a fractal-shaped detector. This detector has sensitivity in all directions by arranging tetrahedral detectors of about 1 cm to 2 cm in fractal shape, and can identify the direction of radiation based on the difference in sensitivity. Previous studies shown that inverse problem analysis can better reproduce the distribution of radiation sources using the radiation count rates. For the design of this system, we propose a new analysis method when added the directional characteristics of radiation in addition to the count rates. This computational evaluation method was applied to an actual prototype detector system, and the sensitivity to actual radiation was compared with the calculated results to clarify the validity of the method.

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