U.S. Department of EnergyOffice of Scientific and Technical Information
Reduction of background by higher order statistics with NMIS
Abstract
Measurements that accumulate the rate of real coincidence between multiplets of detection events (groupings of arbitrary order, e.g., one event, two events, three events, etc.) can yield spurious results if background events arise from processes (e.g., spontaneous fission or neutron spallation) that themselves produce correlated multiplets. This is particularly true if this background varies significantly over time or from one location to another, as it often does in operating facilities, i.e., those not specifically designed to support experimental radiation measurements but that instead rely upon the support of precise radiation measurements for, e.g., NMC and A. In particular, both the quantity and location of radioactive material in weapons facilities changes frequently and unpredictably, and so the background due to the presence (or absence) of this material is completely out of the control of the radiation measurement analyst. Furthermore, numerous Nuclear Materials Identification System (NMIS) measurements have revealed that background often contains mutually correlated events even in the complete absence of material (e.g., {sup 240}Pu) with a significant spontaneous fission rate. The technique subsequently described removes the effects of such self-correlated background from active NMIS measurements. It could be adapted to other active radiation measurements.
- Authors:
- Publication Date:
- Research Org.:
- Oak Ridge Y-12 Plant (Y-12), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Defense Programs (DP) (US)
- OSTI Identifier:
- 759746
- Report Number(s):
- Y/LB-16,064
TRN: US0004142
- DOE Contract Number:
- AC05-84OR21400
- Resource Type:
- Conference
- Resource Relation:
- Conference: Institute of Nuclear Materials Management, New Orleans, LA (US), 07/16/2000--07/20/2000; Other Information: PBD: 11 Jul 2000
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION; RADIATION DETECTION; NUCLEAR FACILITIES; RADIOACTIVE MATERIALS; BACKGROUND NOISE; RADIATION DETECTORS; NUCLEAR MATERIALS MANAGEMENT; COINCIDENCE METHODS
Citation Formats
Mattingly, jk, Mullens, ja, and Mihalczo, jt. Reduction of background by higher order statistics with NMIS. United States: N. p., 2000.
Web.
Mattingly, jk, Mullens, ja, & Mihalczo, jt. Reduction of background by higher order statistics with NMIS. United States.
Mattingly, jk, Mullens, ja, and Mihalczo, jt. 2000.
"Reduction of background by higher order statistics with NMIS". United States. https://www.osti.gov/servlets/purl/759746.
@article{osti_759746,
title = {Reduction of background by higher order statistics with NMIS},
author = {Mattingly, jk and Mullens, ja and Mihalczo, jt},
abstractNote = {Measurements that accumulate the rate of real coincidence between multiplets of detection events (groupings of arbitrary order, e.g., one event, two events, three events, etc.) can yield spurious results if background events arise from processes (e.g., spontaneous fission or neutron spallation) that themselves produce correlated multiplets. This is particularly true if this background varies significantly over time or from one location to another, as it often does in operating facilities, i.e., those not specifically designed to support experimental radiation measurements but that instead rely upon the support of precise radiation measurements for, e.g., NMC and A. In particular, both the quantity and location of radioactive material in weapons facilities changes frequently and unpredictably, and so the background due to the presence (or absence) of this material is completely out of the control of the radiation measurement analyst. Furthermore, numerous Nuclear Materials Identification System (NMIS) measurements have revealed that background often contains mutually correlated events even in the complete absence of material (e.g., {sup 240}Pu) with a significant spontaneous fission rate. The technique subsequently described removes the effects of such self-correlated background from active NMIS measurements. It could be adapted to other active radiation measurements.},
doi = {},
url = {https://www.osti.gov/biblio/759746},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jul 11 00:00:00 EDT 2000},
month = {Tue Jul 11 00:00:00 EDT 2000}
}