Effect of double false pulses in calibrated neutron coincidence collar during measuring time-correlated neutrons from PuBe neutron sources

Nguyen, Tam Cong; Huszti, J.; Nguyen, Quan Van

doi:10.1016/j.nimb.2015.06.019

Cited by 3 publications

(12 citation statements)

References 8 publications

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“…Recent results have shown that contrary to the commonly-held assumption that a pre-delay is effective in eliminating the effect of double pulsing in shift register-based time correlation analysis, double pulsing still affects the measured coincidence rates [3]. This research also showed that double-pulsing yields a distinctive signature in the Rossi-alpha distribution (RAD),…”

Section: Introductionmentioning

confidence: 86%

“…As the design of 3 He counters can have an effect on the intensity and magnitude of imperfections such as double pulsing, the starting point of these simulations is as accurate and detailed a description of an actual counter as possible. Neutron coincidence and multiplicity counters are typically a composite of many 3 He tubes, with several tubes electronically bundled to the same preamplifier. Note that preamplifiers refer here to a signal processing unit composed of signal shaping and identification and logical pulse generation.…”

Section: High-fidelity Neutron Coincidence Counter Simulationsmentioning

confidence: 99%

“…To simulate double pulsing and dead time, the neutron-capture location (i.e. in which 3 He tube the capture occurred) along with the time of a neutron detection is tracked, so it is possible to add these electronic imperfections to the simulations on a preamplifier level.…”

Section: High-fidelity Neutron Coincidence Counter Simulationsmentioning

confidence: 99%

“…While previous work [3] focused on the effect that double pulsing has on singles and doubles rates and noticed a signature of double pulsing in the RAD, current research characterizes the quantitative effects double pulsing has on both the RAD and the correlated rates, including higher order multiplicities not addressed in [3], so as to be able to recognize and correct for it.…”

Section: Introductionmentioning

confidence: 97%

“…Assay of special nuclear material (SNM) for international nuclear safeguards typically relies on nondestructive assay techniques such as neutron coincidence and multiplicity counting. This is most often done using 3 He-based detector systems and shift register analysis to extract and quantify neutron correlations [1,2]. These techniques suffer from detector and electronics effects such as dead time or can be affected by detector and electronics artifacts like double pulsing.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Characterizations of double pulsing in neutron multiplicity and coincidence counting systems

Koehler

Henzl

Croft

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

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Passive neutron coincidence/multiplicity counters are subject to non-ideal behaviour, such as double pulsing and dead time. It has been shown in the past that double-pulsing exhibits a distinct signature in a Rossi-alpha distribution, which is not readily noticed using traditional Multiplicity Shift Register analysis. However, it has been assumed that the use of a pre-delay in shift register analysis removes any effects of double pulsing. In this work, we use high-fidelity simulations accompanied by experimental measurements to study the effects of double pulsing on multiplicity rates. By exploiting the information from the double pulsing signature peak observable in the Rossi-alpha distribution, the double pulsing fraction can be determined. Algebraic correction factors for the multiplicity rates in terms of the double pulsing fraction have been developed. We discuss the role of these corrections across a range of scenarios.

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Section: Introductionmentioning

confidence: 86%

Section: High-fidelity Neutron Coincidence Counter Simulationsmentioning

confidence: 99%

Section: High-fidelity Neutron Coincidence Counter Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Characterizations of double pulsing in neutron multiplicity and coincidence counting systems

Koehler

Henzl

Croft

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

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Principles of Neutron Coincidence Counting

Swinhoe,

Ensslin,

Hutchinson

et al. 2024

Nondestructive Assay of Nuclear Materials for Safeguards and Security

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This chapter describes the principles involved with using neutron coincidences that obtain more information about a measured sample than through singles counting alone. The chapter describes the origin of neutron correlations and how they manifest themselves in the neutron pulse train from a detector. The Rossi-α distribution is presented. The chapter then describes measurement and analysis methods used to extract and analyze correlated counting rates, such as the Feynman variance to mean method and the shift register coincidence circuit. These methods can be used to estimate fission rate and neutron multiplication. Dead time corrections, multiple pulsing and the uncertainties resulting from counting statistics are presented. Several passive methods for the determination of 240Pueffective mass are presented in detail: ‘passive calibration curve’, ‘known alpha’ and ‘known multiplication’. This is followed by a description of active coincidence methods, in which an external neutron source is used to induce fission in the item of interest. This section includes a discussion of the selection of the external source, the use of fast and thermal interrogation modes and a presentation of measurement uncertainties. One example is given of an active technique to measure uranium linear density and burnable poison simultaneously.

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Investigating the non-ideal behavior of the Amptek A111 charge sensitive preamplifier & discriminator board—3He proportional counter combination used in common safeguards neutron coincidence counters

Simone

Croft

Britton

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

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Effect of double false pulses in calibrated neutron coincidence collar during measuring time-correlated neutrons from PuBe neutron sources

Cited by 3 publications

References 8 publications

Characterizations of double pulsing in neutron multiplicity and coincidence counting systems

Characterizations of double pulsing in neutron multiplicity and coincidence counting systems

Principles of Neutron Coincidence Counting

Investigating the non-ideal behavior of the Amptek A111 charge sensitive preamplifier & discriminator board—3He proportional counter combination used in common safeguards neutron coincidence counters

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