NDLI: Time series evaluation of portal monitor data

Content Provider	IEEE Xplore Digital Library
Author	Robinson, S.M. Bender, S.E. LoPresti, C.A. Woodring, M.L.
Copyright Year	2008
Description	Author affiliation: Pennsylvania State University, State College, USA (Bender, S.E.) \|\| Pacific Northwest National Laboratory, Richland, WA, USA (Robinson, S.M.; LoPresti, C.A.; Woodring, M.L.)
Abstract	Radiation portal monitor (RPM) systems perform cargo screening at U.S. and other ports of entry. The data from these systems are routinely evaluated in regard to energy spectrum and total count rate above background. However, few analyses are performed on the time progression of data. In this work, the time series of data from an RPM system are evaluated for the presence of sources of interest by isolating the contribution of anomalous radiation. Source contributions are isolated by comparing the background spectra (or energy-windowed spectral information from low energy-resolution systems) to the spectrum at each successive time step. At every time in the data sequence, the total gross-count signal is turned into a “spectral distance” index using this method. This has the potential to dramatically reduce systematic fluctuations due to background attenuation by a vehicle (the so-called “shadow shielding” effect), and allow for time-series shape fitting for source size discrimination. The anomalous time series is reanalyzed for the presence of compact sources by using a wavelet filter function of similar size to the expected source profile. This may allow a dramatic reduction in gross-count alarm thresholds, leading to a corresponding sensitivity increase. This increase is shown by analysis of a number of real drive-through data sets taken at a U.S. port of entry. A set of isotopes of interest are injected into the data set, and the resultant “benign” and “injected” data sets are analyzed with gross-counting, spectral-ratio, and spatial algorithms. Spatial analysis alone was not sufficient to increase overall sensitivity given this data set, but both methods together gave a significant increase to detection performance.
Starting Page	1302
Ending Page	1305
File Size	2568502
Page Count	4
File Format	PDF
ISBN	9781424427147
ISSN	10957863
DOI	10.1109/NSSMIC.2008.4774645
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-10-19
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Portals Performance analysis Radiation monitoring Fluctuations Attenuation Vehicles Shape Filters Isotopes Data analysis
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
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
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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