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

Abstract

At the Fukushima Daiichi Nuclear Power Station (FDNPS) where an accident occurred due to a large tsunami caused by the Great East Japan Earthquake, understanding the distribution of radioactive substances is important to reduce the exposure dose to workers and establish decontamination plans. We focused on the importance of visualizing beta-emitting radiation sources in addition to gamma-emitting ones and proposed a method for three-dimensionally (3D) visualizing the location of beta-emitting radiation sources, which is important in discussing the effective dose for the crystalline lens of the eye. In this report, we have developed a technique to visualize the location of beta-emitting radiation sources in 3D by combining a directional Geiger-Mueller counter (G-M counter) with Structure from Motion (SfM). An image of 90Sr beta-ray source reconstructed using a beta-ray detector was projected onto a 3D model of the measurement area created using SfM, and the source location is identified in 3D. Additionally, we estimated the radioactivity of the visualized source. Then, by combining the beta-ray detector with a Compton camera, distinguishing between beta- and gamma-emitting radiation sources was possible. This study was based on the concept of integrated radiation imaging system (iRIS), which integrates multiple radiation detectors and environmental recognition devices.

Real-time mixed reality display of dual particle radiation detector data

“…Our network was trained for both photons and neutrons and is able to provide a location estimation for either type of source in real-time. Other studies showed the MR visualization of radiation hot spots on a tablet device or AR using data from Geiger Mueller counters on a robot 30 or a UAV 31 . We build upon these by demonstrating MR visualization in real-time, on a head mounted device, for both gamma ray and neutron detection.…”

Recent Development on Determination of Low-Level 90Sr in Environmental and Biological Samples: A Review

“…In such case, the sample is repeatedly counted for the in-growth of 90 Y; thereby, the activity of 90 Sr can be calculated. Sato et al [115] have developed a technique to visualize the locations of 90 Sr source in 3D by combining a directional GM counters with Structure from Motion (SfM) and a method to estimate the radioactivity of the visualized source. Additionally, by combining a beta-ray detector with a Compton camera, they demonstrated that 90 Sr and 137 Cs can be visualized separately.…”