Digital neutron/gamma discrimination with an organic scintillator at energies between 1 MeV and 100 MeV

Comrie, A.; Buffler, Andy; Smit, F. D.; Wörtche, H. J.

doi:10.1016/j.nima.2014.10.058

Cited by 23 publications

(7 citation statements)

References 27 publications

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“…In an ideal detector, statistical fluctuations in pulse shape lead to Gaussian distributions of for gamma-ray and neutron events with equal values of . It has been shown that the digital charge comparison method provides near-optimal separation at high energies, providing the short integration time, , is carefully optimised for a chosen light output range [17]. Differences in the pulse shape of the light output lead to optimal integration times at MeV of 30 ns and 50 ns for EJ301 and EJ299-33 respectively.…”

Section: Frommentioning

confidence: 99%

Neutron Spectrometry with EJ299-33 Plastic Scintillator for <formula formulatype="inline"><tex Notation="TeX">${E_n} = 10 \! - \! 100 ~\hbox{MeV}$</tex></formula>

Buffler

Comrie

Smit

et al. 2015

IEEE Trans. Nucl. Sci.

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A neutron spectrometer based on a single EJ299-33 plastic scintillator ( cm diameter cm) is described. A digital implementation of pulse shape discrimination is used to separate events associated with neutrons from those associated with gamma-rays. Measurements made using a ns-pulsed neutron beam are used to produce response functions of the detector for neutrons over the energy range 10 -100 MeV. These lineshapes are used to test the capability of the spectrometer to produce neutron energy spectra, via the unfolding of pulse height spectra, for use in neutron fields having any type of time structure. The results are compared with those from a similar spectrometer constructed from EJ301 liquid scintillator.

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Section: Frommentioning

confidence: 99%

Neutron Spectrometry with EJ299-33 Plastic Scintillator for <formula formulatype="inline"><tex Notation="TeX">${E_n} = 10 \! - \! 100 ~\hbox{MeV}$</tex></formula>

Buffler

Comrie

Smit

et al. 2015

IEEE Trans. Nucl. Sci.

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“…A second parameter QS was calculated by integrating the pulse over a shorter time interval (tS), optimized to be 30 ns. 17 A pulse shape parameter S was then defined as (3) which is the basis of a charge comparison method of pulse shape discrimination. 18 Constants k and C were chosen in order to appropriately scale and offset S. Figure 2 shows distributions of events as a function of parameters L and S for two typical runs with Fig.…”

Section: Methodsmentioning

confidence: 99%

Neutron transmission studies for concrete used in the nuclear industry

Buffler

Hutton

Leadbeater

et al. 2020

Int. J. Mod. Phys. Conf. Ser.

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Progress in the establishment of a fast neutron beam reference facility for the non-destructive testing of concrete and other materials used in the nuclear industry is described. An additional area of interest is the development of methods for the independent verification of the alignment to regulatory codes of the constituent materials used in concrete mixes for nuclear facilities, both existing and planned. The project is based on the principle of analyzing the distributions in energy of the neutrons transmitted through the sample. Modern methods of spectrum unfolding allow such analyses to be undertaken without the need for the neutron beam to be ns-pulsed in order to measure neutron energies by time-of-flight. First measurements and analyses of mortar (concrete without large aggregate) using continuous beams of fast neutrons are presented.

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“…The widespread use of digitizers, supported by cheap commodity storage, have made it common practice to keep detailed records of every critical signal in an experiment with nanosecond precision. With this capability, PSD analysis no longer requires dedicated hardware, e.g., using fixed width integration windows [2]. More detailed signal analyses using fits becomes possible.…”

Section: Timesmentioning

confidence: 99%

“…The decay tail may consist of multiple exponential components depending on the formulation of the liquid and particle being detected. For example, NE213 and the equivalent formulations of EJ301 and BC501A, are designed for fast neutron counting with good pulse-shape discrimination [1] (PSD) capability for distinguishing gamma from neutron interactions in the detector [2]. The sensitivity of the decay time of the emitted light to the type of particle interaction in the liquid is due to the dependence on the mechanism of excitation.…”

Section: Introductionmentioning

confidence: 99%

A functional form for liquid scintillator pulse shapes

Friesen

Howell

2020

Nuclear Instruments and Methods in Physics Research Section A:

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Digitization of detector signals enables analysis of the original waveform to extract timing, particle identification, and energy deposition information. Here we present the use of analytical functions based on sigmoids to model and fit such pulse shapes from liquid organic scintillators, though the method should also be applicable to other detector systems. Neutron and gamma interactions in NE213 detectors were digitized from the phototube anode and fit using a sigmoid-based function. The acuity of the fit in extracting timing information and performing neutron-gamma pulse-shape discrimination are presented and discussed.

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Digital neutron/gamma discrimination with an organic scintillator at energies between 1 MeV and 100 MeV

Cited by 23 publications

References 27 publications

Neutron Spectrometry with EJ299-33 Plastic Scintillator for <formula formulatype="inline"><tex Notation="TeX">${E_n} = 10 \! - \! 100 ~\hbox{MeV}$</tex></formula>

Neutron Spectrometry with EJ299-33 Plastic Scintillator for <formula formulatype="inline"><tex Notation="TeX">${E_n} = 10 \! - \! 100 ~\hbox{MeV}$</tex></formula>

Neutron transmission studies for concrete used in the nuclear industry

A functional form for liquid scintillator pulse shapes

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