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Improvements in the method of radiation anomaly detection by spectral comparison ratios
D M Pfund1, K K Anderson1, R S Detwiler1
1Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA 99352 USA.
Abstract:
We present a new procedure for configuring the Nuisance-rejection Spectral Comparison Ratio Anomaly Detection (N-SCRAD) method. The procedure minimizes detectable count rates of source spectra at a specified false positive rate using simulated annealing. We also present a new method for correcting the estimates of background variability used in N-SCRAD to current conditions of the total count rate. The correction lowers detection thresholds for a specified false positive rate, enabling greater sensitivity to targets.
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