NDLI: Depth determination of buried caesium-137 and cobalt-60 sources using scatter peak data

Content Provider	IEEE Xplore Digital Library
Author	Adams, J.C. Mellor, M. Joyce, M.J.
Copyright Year	2009
Description	Author affiliation: Engineering Department, Lancaster University, LA1 4YR, UK (Adams, J.C.; Joyce, M.J.) \|\| REACT Engineering Ltd, Fleswick Court, Westlakes Science & Technology Park Moor Row, Whitehaven, Cumbria CA24 3HZ, UK (Mellor, M.)
Abstract	An investigation into an alternative approach to 3D source mapping is proposed, by combining the insights of two existing techniques. The first of these is a 3D ‘imaging’ tool, $N-Visage^{™}$ that has been developed by REACT Engineering Ltd. This technique is efficient and robust, but is not a true 3D technique as it relies on user-supplied 2D manifolds to constrain source locations. The second technique uses the γ-photopeak and an x-ray peak to determine radionuclide source depth using a relative attenuation method. We look at the possibility of combining both techniques to constrain both the location and depth of a radiological source buried under shielding. It is believed a combined method using spectra recorded above the shielding object will be of use in the nuclear decommissioning and land contamination industries. $N-Visage^{™}$ has previously been used to map source distributions of mixed radionuclides with complex geometries through shielding media. The software works by producing a computer model which recreates the experimental setup. A survey is imported, comprising a set of γ-spectra recorded with an instrument of known efficiency and isotropy taken at a variety of locations around the area of interest. A survey plan recording the location and orientation of the instrument for each reading is also reconstructed. $N-Visage^{™}$ is then able to determine the locations of the source(s) without prior knowledge of exactly where they are located, by building and inverting a simple physical model relating potential source locations to the recorded spectra. This research sets out to investigate the possibility of combining the geometric insights of $N-Visage^{™}$ with a method of extracting depth information from scatter data, rather than the x-ray peak. By combining the γ-photopeak and scatter areas of a spectrum, the thickness of the shielding media between source and detector can potentially be inferred. Using scattered photons rather than x-ray attenuation is preferable where depths are of a sufficient thickness to effectively eliminate a measurable x-ray photopeak.
Starting Page	1
Ending Page	7
File Size	734283
Page Count	7
File Format	PDF
ISBN	9781424452071
DOI	10.1109/ANIMMA.2009.5503702
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-07
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Radioactive pollution Gamma distributions Instruments Optical imaging X-ray imaging Contamination Nuclear measurements Manifolds Geometry Gamma rays X-ray scattering Position measurement Attenuation Robustness
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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