Variance and higher order signal moments in neutron flux measurements

Bärs, Bruno

doi:10.1016/0168-9002(89)90716-x

Cited by 5 publications

(1 citation statement)

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“…that of the gamma detections, can be significantly reduced by the use of Campbelling techniques. One can extend the relationships (1) even to higher order moments (semiinvariants), leading to higher order Campbelling techniques [5][6][7], lending the possibility of even further reduction of the contributions from gamma detection and other unwanted components such as alpha particles. The complete process of neutron detection in a fission chamber, starting with the fission in the fissile deposit of the detector, the slowing down and escape of the fission products, the charge generation, collection and amplification is a complex process.…”

Section: Introductionmentioning

confidence: 98%

Comments on the stochastic characteristics of fission chamber signals

Пал¹,

Pázsit²,

Elter³

2014

Nuclear Instruments and Methods in Physics Research Section A:

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a b s t r a c tThis paper reports on theoretical investigations of the stochastic properties of the signal series of ionisation chambers, in particular fission chambers. First, a simple and transparent derivation is given of the higher order moments of the random detector signal for incoming pulses with a non-homogeneous Poisson distribution and random pulse heights and arbitrary shape. Exact relationships are derived for the higher order moments of the detector signal, which constitute a generalisation of the so-called higher order Campbelling techniques. The probability distribution of the number of time points when the signal exceeds a certain level is also derived. Then, a few simple pulse shapes and amplitude distributions are selected as idealised models of the detector signals. Assuming that the incoming particles form a homogeneous Poisson process, explicit expressions are given for the higher order moments of the signal and the number of level crossings in a given time interval for the selected pulse shapes.

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Section: Introductionmentioning

confidence: 98%