Radiation imaging using a compact Compton camera inside the Fukushima Daiichi Nuclear Power Station building

Sato, Yuki; Tanifuji, Yuta; Terasaka, Yuta; Usami, Hiroshi; Kaburagi, Masaaki; Kawabata, Kuniaki; Utsugi, Wataru; Kikuchi, Hiroyuki; Takahira, Shiro; Torii, Tatsuo

doi:10.1080/00223131.2018.1473171

Cited by 52 publications

(20 citation statements)

References 7 publications

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“…. Panel (c) shows the Compton camera, which is the same device as that used for hotspot detection inside the turbine building of Unit 3 of FDNPS described in Ref [5]. The lead shield on the top of the gamma-ray sensor was removed to show the insides.…”

Section: Drawing Hotspot Image On 3-d Structural Model Of Inside the mentioning

confidence: 99%

“…Previously, we conducted a radiation imaging experiment inside the turbine building of Unit 3 of the FDNPS by using a compact Compton camera and succeeded in visualizing hotspots (up to 3.5 mSv/h) [5]. In that test, lead shields with a thickness of 1 cm each were placed on five faces, except for the front side of the gamma-ray sensor, to reduce the number of gamma rays incident on the gamma-ray sensor.…”

Section: Introductionmentioning

confidence: 99%

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Radiation imaging using a compact Compton camera mounted on a crawler robot inside reactor buildings of Fukushima Daiichi Nuclear Power Station

Sato

Terasaka

Utsugi

et al. 2019

Journal of Nuclear Science and Technology

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The Fukushima Daiichi Nuclear Power Station (FDNPS), operated by Tokyo Electric Power Company Holdings, Inc., went into meltdown in the aftermath of a large tsunami caused by the Great East Japan Earthquake of 11 March 2011. Measurement of radiation distribution inside the FDNPS buildings is indispensable to execute decommissioning tasks in the reactor buildings. We conducted a radiation imaging experiment inside the reactor building of Unit 1 of FDNPS by using a compact Compton camera mounted on a crawler robot and remotely visualized gamma-rays streaming from deep inside the reactor building. Moreover, we drew a radiation image obtained using the Compton camera onto the three-dimensional (3-D) structural model of the experimental environment created using photogrammetry. In addition, the 3-D model of the real working environment, including the radiation image, was imported into the virtual space of the virtual reality system. These visualization techniques help workers recognize radioactive contamination easily and decrease their own exposure to radiation because the contamination cannot be observed with the naked eye.

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Section: Drawing Hotspot Image On 3-d Structural Model Of Inside the mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Radiation imaging using a compact Compton camera mounted on a crawler robot inside reactor buildings of Fukushima Daiichi Nuclear Power Station

Sato

Terasaka

Utsugi

et al. 2019

Journal of Nuclear Science and Technology

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“…Moreover, research has been conducted inside the FDNPS building. Since people cannot enter this building for a long periods of time, a small Compton camera was mounted on a robot and remote measurement was carried out [9,10]. The study demonstrated that the Compton cameras are effective for remote measurement in a narrow and high-dose-rate field.…”

Section: Introductionmentioning

confidence: 99%

Simulation Study of a Shield-Free Directional Gamma-Ray Detector Using Small-Angle Compton Scattering

Kitayama

Terasaka

Sato

et al. 2021

Journal of Nuclear Engineering and Radiation Science

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Gamma-ray imaging is a technique for visualize the spatial distribution of radioactive materials. Gamma-ray imaging has recently been applied to research on environmental restoration and decommissioning of the Fukushima Daiichi Nuclear Power Station (FDNPS). In the present paper, we present an elemental technology study of the Gamma-ray Imager using Small-Angle Scattering (GISAS), which is intended for application at the FDNPS decommissioning site. GISAS consists of a set of directional gamma-ray detectors that do not require a shield. In this study, we investigated the feasibility of a shield-free directional gamma-ray detector by simulation. The simulation result suggests that by measuring scattered-electron energies of several keV using a scatterer detector, gamma rays with ultra-small-angle scattering could be selected. Using Compton scattering kinematics, a shield-free detector with a directivity of about 10 degree may be feasible. By arranging the directional gamma-ray detectors in an array, we expect to be able to realize the GISAS, which is small, light, and capable of quantitative measurement.

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“…This is both extremely time consuming when monitoring large areas manually and also relies heavily on operators being diligent during their surveys. Beta and c radiation, having greater permeability in air ( b less than ), c can be detected at a distance, although the technology to iden tify the precise location of any source materials is an important area of active research [4].…”

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confidence: 99%

A Robot to Monitor Nuclear Facilities: Using Autonomous Radiation-Monitoring Assistance to Reduce Risk and Cost

Bird

Griffiths

Martin

et al. 2019

IEEE Robot. Automat. Mag.

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Nuclear facilities often require continuous mo nitoring to ensure there is no contamination of radioactive materials that might lead to safety or environmental issues. The current approach to radiological monitoring is to use human operators, which is both time consuming and cost in efficient. As with many repetitive, routine tasks, there are considerable opportunities for the process to be improved using autonomous robotic systems. This article describes the design and development of an autonomous, groundbased radiologicalmonitoring robot, Continuous Autonomous RadiationMonitoring Assistance (CARMA), and how, when it was deployed in an active area at the U.K. 's Sellafield nuclear site, it detected and located a fixed a source embedded into the floor. This deployment was the first time that a fully autonomous robot had ever been deployed at Sellafield, the largest nuclear site in Europe. Expanding Efforts in an Increasingly Important FieldMonitoring nuclear facilities and rapidly identifying any spread of radiological materials is of global concern.

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Radiation imaging using a compact Compton camera inside the Fukushima Daiichi Nuclear Power Station building

Cited by 52 publications

References 7 publications

Radiation imaging using a compact Compton camera mounted on a crawler robot inside reactor buildings of Fukushima Daiichi Nuclear Power Station

Radiation imaging using a compact Compton camera mounted on a crawler robot inside reactor buildings of Fukushima Daiichi Nuclear Power Station

Simulation Study of a Shield-Free Directional Gamma-Ray Detector Using Small-Angle Compton Scattering

A Robot to Monitor Nuclear Facilities: Using Autonomous Radiation-Monitoring Assistance to Reduce Risk and Cost

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