Detecting changes in maps of gamma spectra with Kolmogorov–Smirnov tests

Various security, regulatory, and consequence management agencies are interested in continuously monitoring wide areas for unexpected changes in radioactivity. Existing detection systems are designed to search for radioactive sources but are not suited to repeat mapping and change detection. Using a...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2015-12, Vol.802, p.31-37
Main Authors: Reinhart, Alex, Ventura, Valérie, Athey, Alex
Format: Article
Language:English
Subjects:
Anomaly detection
Gamma-ray spectroscopy
Mapping
Radiation monitoring
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Summary:Various security, regulatory, and consequence management agencies are interested in continuously monitoring wide areas for unexpected changes in radioactivity. Existing detection systems are designed to search for radioactive sources but are not suited to repeat mapping and change detection. Using a set of daily spectral observations collected at the Pickle Research Campus, we improved on the prior Spectral Comparison Ratio Anomaly Mapping (scram) algorithm and developed a new method based on two-sample Kolmogorov–Smirnov tests to detect sudden spectral changes. We also designed simulations and visualizations of statistical power to compare methods and guide deployment scenarios.
ISSN:0168-9002
1872-9576
DOI:10.1016/j.nima.2015.09.002