Details

Autor(en) / Beteiligte

• Pfund, D.M.
• Anderson, K.K.
• Detwiler, R.S.
• Jarman, K.D.
• McDonald, B.S.
• Milbrath, B.D.
• Myjak, M.J.
• Paradis, N.C.
• Robinson, S.M.
• Woodring, M.L.

Titel

Improvements in the method of radiation anomaly detection by spectral comparison ratios

Ist Teil von

• Applied radiation and isotopes, 2016-04, Vol.110 (C), p.174-182

Ort / Verlag

England: Elsevier Ltd

Erscheinungsjahr

2016

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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. •We discuss enhancements to the method of spectral comparison ratios (now called Nuisance rejection Spectral Comparison Ratio Anomaly Detection, or N-SCRAD).•Test statistics and spectral regions of interest are now optimized with simulated annealing (SA).•The automated determination of parameters with SA enables training of the algorithm on a large, spectrally diverse threat basis.•Estimates of the covariance of the spectral comparison ratios are now corrected for sudden changes in the total count rate of background.•The covariance correction enables a greater sensitivity to targets and/or a reduction in false positive rates.