Higher-order statistics from NMIS to measure neutron and gamma ray cross talk in plastic scintillators

Pozzi, Sara A.; Oberer, R.B.; Chiang, L.G.; Mattingly, John; Mihalczo, J.T.

doi:10.1016/s0168-9002(01)01390-0

Cited by 5 publications

(3 citation statements)

References 11 publications

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“…The source-photon-neutron signature is an especially interesting signature to look at because it is highly resistant to cross talk interference (37), and because the difference between DU and tungsten is significant. Overall, there is a clear and significant difference between the DU and tungsten in most signatures.…”

Section: Exploration Of Signatures In Datamentioning

confidence: 99%

Incorporation of Photon Analysis into an Active Interrogation System for Shielded Uranium Characterization

Canion

2016

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Section: Exploration Of Signatures In Datamentioning

confidence: 99%

Incorporation of Photon Analysis into an Active Interrogation System for Shielded Uranium Characterization

Canion

2016

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“…In active measurements, 252 Cf sources-driven correlation measurement method is a popular one [12,13]. Based on this method, ORNL (Oak Ridge National Laboratory) had designed a nuclear material identification system (NMIS) aiming to verify the fissile material [14][15][16]. This method has been used successfully in the past to identify various uranium components, but nearly all of them focused on mass and enrichment [7,[17][18][19].…”

Section: Introductionmentioning

confidence: 99%

The Feasibility Study for Multigeometries Identification of Uranium Components Using PCA-LSSVM Based on Correlation Measurements

Zhou

Feng

Liu

et al. 2018

Science and Technology of Nuclear Installations

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The geometry of uranium components is one of the key characteristics and strictly confidential. The geometry identification of metal uranium components was studied using 252Cf source-driven correlation measurement method. For the 3 uranium samples with the same mass and enrichment, there are subtle differences in neutron signals. Even worse, the correlation functions were disturbed by scatter neutrons and include “accidental” coincidence, which is not conductive to the geometry identification. In this paper, we proposed an identification method combining principal component analysis and least-square support vector machine (PCA-LSSVM). The results based on PCA-LSSVM showed that the training precision was 100% and the test precision was 95.83% of the identification model. The total precision of the identification model was 98.41%, which indicated that the identification model was an effective way to identify the geometry properties with the correlation functions.

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“…The theory underlying the mass reconstruction assumes neutrons are only counted once, which is a correct assumption for 3 He tubes. However, because fast neutrons can scatter multiple times between scintillators [5,6,7,8] and register artificially correlated counts, this traditional moment method unfortunately fails for scintillators. Using modified expressions for the moment method to theoretically account for multiple scattering, it was shown [9,10] that the calculated fractions of neutrons scattering multiple times can be used to apply corrections to the masses of nuclear materials undergoing fission.…”

Section: Introductionmentioning

confidence: 99%

Method for measuring multiple scattering corrections between liquid scintillators

Verbeke

Glenn

Keefer

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

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A time-of-flight method is proposed to experimentally quantify the fractions of neutrons scattering between scintillators. An array of scintillators is characterized in terms of crosstalk with this method by measuring a californium source, for different neutron energy thresholds. The spectral information recorded by the scintillators can be used to estimate the fractions of neutrons multiple scattering. With the help of a correction to Feynman's point model theory to account for multiple scattering, these fractions can in turn improve the mass reconstruction of fissile materials under investigation.

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Higher-order statistics from NMIS to measure neutron and gamma ray cross talk in plastic scintillators

Cited by 5 publications

References 11 publications

Incorporation of Photon Analysis into an Active Interrogation System for Shielded Uranium Characterization

Incorporation of Photon Analysis into an Active Interrogation System for Shielded Uranium Characterization

The Feasibility Study for Multigeometries Identification of Uranium Components Using PCA-LSSVM Based on Correlation Measurements

Method for measuring multiple scattering corrections between liquid scintillators

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