Three-dimensional visualization of a beta-emitting nuclide by combining a directional Geiger-Mueller counter and Structure from Motion

多視点ステレオ写真測量技術と指向性GMカウンタを組み合わせることによる線放出核種の3次元可視化

佐藤 優樹  ; 峯本 浩二郎*; 根本 誠*

Sato, Yuki; Minemoto, Kojiro*; Nemoto, Makoto*

At the Fukushima Daiichi Nuclear Power Station (FDNPS) where the accident occurred due to large tsunami caused by the Great East Japan Earthquake of 11 March 2011, it is important to understand and visualize the distribution of radioactive substances in order to reduce exposure doses of workers and to establish decontamination plans. We focused on the importance of visualizing beta-emitting nuclides in addition to gamma-emitting ones to reduce the exposure dose of workers at the FDNPS, and proposed a method for three-dimensional (3-D) visualizing the position of beta-emitting ones. By combining directional Geiger-Mueller counter with Structure from Motion technology using a digital camera, we succeeded in visualizing a beta-emitting nuclide of Sr-source on the 3-D model of the working environment.