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**Harvard**

Pal, L. och Pázsit, I. (2016) *Stochastic Theory of the Fission Chamber Current Generated by Non-Poissonian Neutrons*.

** BibTeX **

@article{

Pal2016,

author={Pal, L. and Pázsit, Imre},

title={Stochastic Theory of the Fission Chamber Current Generated by Non-Poissonian Neutrons},

journal={Nuclear science and engineering},

issn={0029-5639},

volume={184},

issue={4},

pages={537-550},

abstract={The Campbell theorem, relating the variance of the current of a fission chamber (a "filtered Poisson process") to the intensity of the detection events and to the detector pulse shape, becomes invalid when the neutrons generating the fission chamber current are not independent. Recently, a formalism was developed by the present authors, by which the variance of the detector current can be calculated for detecting neutrons in a subcritical multiplying system, where the detection events are obviously not independent. In the present paper, the previous formalism, which only accounted for prompt neutrons, is generalized to account also for delayed neutrons. A rigorous probabilistic analysis of the detector current was performed by using the same simple, but realistic detector model as in the previous work. The results of the present analysis made it possible to determine the bias of the traditional Campbelling techniques both qualitatively and quantitatively. The results show that the variance still remains proportional to the detection intensity, and is thus suitable for the monitoring of the mean flux, but the calibration factor between the variance and the detection intensity is an involved function of the detector pulse shape and the subcritical reactivity of the system, which diverges for critical systems.},

year={2016},

keywords={Fission chambers, Campbell techniques, correlated events},

}

** RefWorks **

RT Journal Article

SR Electronic

ID 247607

A1 Pal, L.

A1 Pázsit, Imre

T1 Stochastic Theory of the Fission Chamber Current Generated by Non-Poissonian Neutrons

YR 2016

JF Nuclear science and engineering

SN 0029-5639

VO 184

IS 4

SP 537

OP 550

AB The Campbell theorem, relating the variance of the current of a fission chamber (a "filtered Poisson process") to the intensity of the detection events and to the detector pulse shape, becomes invalid when the neutrons generating the fission chamber current are not independent. Recently, a formalism was developed by the present authors, by which the variance of the detector current can be calculated for detecting neutrons in a subcritical multiplying system, where the detection events are obviously not independent. In the present paper, the previous formalism, which only accounted for prompt neutrons, is generalized to account also for delayed neutrons. A rigorous probabilistic analysis of the detector current was performed by using the same simple, but realistic detector model as in the previous work. The results of the present analysis made it possible to determine the bias of the traditional Campbelling techniques both qualitatively and quantitatively. The results show that the variance still remains proportional to the detection intensity, and is thus suitable for the monitoring of the mean flux, but the calibration factor between the variance and the detection intensity is an involved function of the detector pulse shape and the subcritical reactivity of the system, which diverges for critical systems.

LA eng

DO 10.13182/nse16-18

LK http://dx.doi.org/10.13182/nse16-18

OL 30