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Title: Facility Activity Inference Using Radiation Networks

Abstract

We consider the problem of inferring the operational status of a reactor facility using measurements from a radiation sensor network deployed around the facility’s ventilation off-gas stack. The intensity of stack emissions decays with distance, and the sensor counts or measurements are inherently random with parameters determined by the intensity at the sensor’s location. We utilize the measurements to estimate the intensity at the stack, and use it in a one-sided Sequential Probability Ratio Test (SPRT) to infer on/off status of the reactor. We demonstrate the superior performance of this method over conventional majority fusers and individual sensors using (i) test measurements from a network of 21 NaI detectors, and (ii) effluence measurements collected at the stack of a reactor facility. We also analytically establish the superior detection performance of the network over individual sensors with fixed and adaptive thresholds by utilizing the Poisson distribution of the counts. We quantify the performance improvements of the network detection over individual sensors using the packing number of the intensity space.

Authors:
ORCiD logo [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1399415
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: IEEE International Conference on Multisensor Fusion and Integration for Intelligent Systems - Daegu, , South Korea - 11/27/2017 5:00:00 AM-11/29/2017 5:00:00 AM
Country of Publication:
United States
Language:
English

Citation Formats

Rao, Nageswara S., and Ramirez Aviles, Camila A. Facility Activity Inference Using Radiation Networks. United States: N. p., 2017. Web.
Rao, Nageswara S., & Ramirez Aviles, Camila A. Facility Activity Inference Using Radiation Networks. United States.
Rao, Nageswara S., and Ramirez Aviles, Camila A. Wed . "Facility Activity Inference Using Radiation Networks". United States. doi:. https://www.osti.gov/servlets/purl/1399415.
@article{osti_1399415,
title = {Facility Activity Inference Using Radiation Networks},
author = {Rao, Nageswara S. and Ramirez Aviles, Camila A.},
abstractNote = {We consider the problem of inferring the operational status of a reactor facility using measurements from a radiation sensor network deployed around the facility’s ventilation off-gas stack. The intensity of stack emissions decays with distance, and the sensor counts or measurements are inherently random with parameters determined by the intensity at the sensor’s location. We utilize the measurements to estimate the intensity at the stack, and use it in a one-sided Sequential Probability Ratio Test (SPRT) to infer on/off status of the reactor. We demonstrate the superior performance of this method over conventional majority fusers and individual sensors using (i) test measurements from a network of 21 NaI detectors, and (ii) effluence measurements collected at the stack of a reactor facility. We also analytically establish the superior detection performance of the network over individual sensors with fixed and adaptive thresholds by utilizing the Poisson distribution of the counts. We quantify the performance improvements of the network detection over individual sensors using the packing number of the intensity space.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Nov 01 00:00:00 EDT 2017},
month = {Wed Nov 01 00:00:00 EDT 2017}
}

Conference:
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