Investigation and optimisation of mobile NaI(Tl) and 3 He-based neutron detectors for finding point sources

Nilsson, Jens; Finck, Robert; Rääf, Christopher

doi:10.1016/j.nima.2015.03.013

Cited by 1 publication

(1 citation statement)

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“…neutron sources. As was it was observed by Nilsson et al, it would be possible to use regular gamma radiation detectors to detect the neutron radiation [ 15 ]. If appropriate physical detection model would be developed for neutron detection, it would be possible to test the applicability of Bayesian approach for neutron source search, but that is out of the scope of this paper.…”

Section: Introductionmentioning

confidence: 99%

Bayesian algorithm to estimate position and activity of an orphan gamma source utilizing multiple detectors in a mobile gamma spectrometry system

et al. 2021

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To avoid harm to the public and the environment, lost ionizing radiation sources must be found and brought back under the regulatory control as soon as possible. Usually, mobile gamma spectrometry systems are used in such search missions. It is possible to estimate the position and activity of point gamma sources by performing Bayesian inference on the measurement data. The aim of this study was to theoretically investigate the improvements in the Bayesian estimations of the position and activity of a point gamma source due to introduction of data from multiple detectors with angular variations of efficiency. Three detector combinations were tested—a single 123% HPGe detector, single 4l NaI (Tl) detector and a 123% HPGe with 2x4l NaI (Tl) detector combination—with and without angular efficiency variations for each combination resulting in six different variants of the Bayesian algorithm. It was found that introduction of angular efficiency variations of the detectors did improve the accuracy of activity estimation slightly, while introduction of data from additional detectors lowered the signal-to-noise ratio threshold of the system significantly, increasing the stability and accuracy of the estimated source position and activity, for a given signal-to-noise ratio.

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Section: Introductionmentioning

confidence: 99%