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Title: Muon trackers for imaging a nuclear reactor

A detector system for assessing damage to the cores of the Fukushima Daiichi nuclear reactors by using cosmic-ray muon tomography was developed. Furthermore, the system consists of a pair of drift-tube tracking detectors of 7.2× 7.2-m 2 area. In each muon tracker there consists 6 x-layer and 6 y-layer drift-tube detectors. Each tracker is capable of measuring muon tracks with 12 mrad angular resolutions, and is capable of operating under 50-μ Sv/h radiation environment by removing gamma induced background with a novel time-coincidence logic. An estimated resolution to observe nuclear fuel debris at Fukushima Daiichi is 0.3 m when the core is imaged from outside the reactor building.
Authors:
 [1] ;  [1] ; ORCiD logo [2] ;  [2] ;  [3] ; ORCiD logo [2] ;  [1] ; ORCiD logo [2] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Toshiba Corporation, Yokohama (Japan)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Decision Science International Corporation, Poway, CA (United States)
Publication Date:
Report Number(s):
LA-UR-17-24644
Journal ID: ISSN 1748-0221
Grant/Contract Number:
AC52-06NA25396; NFE-14-0019
Type:
Accepted Manuscript
Journal Name:
Journal of Instrumentation
Additional Journal Information:
Journal Volume: 11; Journal Issue: 09; Journal ID: ISSN 1748-0221
Publisher:
Institute of Physics (IOP)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE; Toshiba Corporation
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; Detection of defects; Detection of explosives; Radiation monitoring; Search for radioactive and fissile materials; muon imaging; muon scattering; Fukushima Daiichi
OSTI Identifier:
1406226