New approach to neutron spectrometry with multi element scintillator

Machrafi, R.; Miller, Alexander L.; Khan, Nafisah

doi:10.1016/j.radmeas.2015.06.009

Cited by 4 publications

(2 citation statements)

References 65 publications

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“…Multi-element scintillator systems are increasingly used in a broad range of applications such as neutron spectrometry [1], nuclear security [2], nuclear reaction [3] positron emission tomography [4] and all detector are required to operate as identical to each other as possible. However, typically, there is a significant difference in the performance of the scintillator material, the photomultiplier tubes and/or the quality of the coupling which leads to variance in the detectors performances.…”

Section: Introductionmentioning

confidence: 99%

Time-dependent characterisation of stability performance of EJ-309 detector systems

Astromskas

Joyce

2018

EPJ Web Conf.

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Section: Introductionmentioning

confidence: 99%

Time-dependent characterisation of stability performance of EJ-309 detector systems

Astromskas

Joyce

2018

EPJ Web Conf.

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“…Multi-element scintillator systems are used increasingly in a broad range of applications such as neutron spectrometry [1], nuclear security [2][3][4], fundamental studies of nuclear reactions [5][6][7], and in medical imaging for positron emission tomography (PET), single-photon emission computed tomography (SPECT) or X-ray imaging [8]; in such applications it is usually required that the response of each detector across an array is as consistent as possible. Non-destructive active interrogation techniques utilising neutrons and photons operate in environments where the incoming radiation flux can change by a few orders of magnitude in an instant, thus requiring detection systems to have a characterised drift of response [9].…”

Section: Introductionmentioning

confidence: 99%

Investigation of instabilities of photomultiplier tubes for multi-element detector systems

2018

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This paper presents an investigation into response of instabilities of EJ-309 liquid scintillator detectors. A brief review of common instabilities associated with the photomultiplier tubes (PMTs) is presented. The energy response, relative efficiency, energy linearity and warmup duration of sixteen EJ-309 detectors coupled to PMTs tested is presented. A single-channel mixed-field analyser digitiser system was used for data acquisition. Furthermore, timing information of the common instability behaviours is presented alongside suggestions on how to correct for such instabilities. The results show that the relative efficiencies amongst the detectors can vary up to 7%; a multi-energy energy calibration must be performed to ensure energy linearity; the detectors must be warmed-up by ~45 minutes before stable response is achieved; the re-warmup duration depends on the duration of the high voltage supplied to the PMT being switched off. The results indicate that the PMTs take approximately 2 hours to reach "cold" state, where a full warm-up duration must be applied. The reported instability effects will be taken into account when developing a sophisticated auto-calibration methodology for a multi-element detector system.

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