Simulated Neutron Response Functions of Phoswich-Type Neutron Detector and Thin Organic Liquid Scintillator

Takada, Masashi; Yajima, Kazuaki; Kamada, So; Yasuda, Hiroshi; Nakamura, Takashi

doi:10.15669/pnst.2.274

Cited by 10 publications

(8 citation statements)

References 11 publications

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“…Takada et al used a direct method, where protons were impinged directly into an EJ-309 scintillator cell, with an unspecified integration length. [8] Bai et al used a short integration length with an edge characterization technique that incorporated a Monte Carlo simulation to obtain the final light yield relation through comparison between measured and simulated pulse integral spectra. [27] Lawrence et al and Tomanin et al used edge characterization and a Monte Carlo trial response, respectively, with long integration lengths.…”

Section: Resultsmentioning

confidence: 99%

“…More recently, Takada et al used energetic protons up to 70 MeV to measure the proton light yield of an EJ-309 organic liquid scintillator in a phoswich-type configuration. [8] A thorough review of the early direct measurements is provided by Birks. [11] The direct approach to light yield measurement poses several challenges.…”

Section: A Direct Methodsmentioning

confidence: 99%

“…[5] With a similar formulation to EJ-301, a higher flash point, and a lower chemical toxicity, EJ-309 is quickly becoming an industry standard and has been targeted extensively in recent light yield measurements. [6][7][8][9] The data analysis and uncertainty quantification procedures for the EJ-301 and EJ-309 proton light yield measurements are detailed in Sec. V. The results are given in Sec.…”

Section: Introductionmentioning

confidence: 99%

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Proton light yield in organic scintillators using a double time-of-flight technique

Brown

Goldblum

Laplace

et al. 2018

Journal of Applied Physics

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Recent progress in the development of novel organic scintillators necessitates modern characterization capabilities. As the primary means of energy deposition by neutrons in these materials is n-p elastic scattering, knowledge of the proton light yield is paramount. This work establishes a new model-independent method to continuously measure proton light yield in organic scintillators over a broad energy range. Using a deuteron breakup neutron source at the 88-Inch Cyclotron at Lawrence Berkeley National Laboratory and an array of organic scintillators, the proton light yield of EJ-301 and EJ-309, commercially available organic liquid scintillators from Eljen Technology, were measured via a double time-of-flight technique. The light yield was determined using a kinematically over-constrained system in the proton energy range of 1 − 20 MeV. The effect of pulse integration length on the magnitude and shape of the proton light yield relation was also explored. This work enables accurate simulation of the performance of advanced neutron detectors and supports the development of next-generation neutron imaging systems.

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Section: Resultsmentioning

confidence: 99%

Section: A Direct Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Proton light yield in organic scintillators using a double time-of-flight technique

Brown

Goldblum

Laplace

et al. 2018

Journal of Applied Physics

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“…The measurement was performed witha 12.7 cm thick x 12.7 cm diameter EJ-309 liquid scintillator detector coupled to a Photonics XP4512B photomultiplier tubes (PMT).The data were generated using a 10-meter flight path and neutrons were generated using the 27 It should be noted that in this work, as in [13], the term 'pulse height' refers to the maximum of the digitized pulse, as opposed to the pulse integral. Pulse height is not always proportional to pulse integral, so it is not in general possible to easily translate between pulse height and pulse integral based light output functions.…”

Section: Light Output Fitting Methodologymentioning

confidence: 99%

Evaluation of neutron light output response functions in EJ-309 organic scintillators

Norsworthy

Poitrasson-Rivière

Ruch

et al. 2017

Nuclear Instruments and Methods in Physics Research Section A:

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An accurate model of the nonlinear detector response of organic scintillators to neutrons is required to correctly simulate fast neutron detection, as well as interpret measured pulse height data. Several empirical and semi-empirical models are available to fit measured scintillator light output data. In this work, EJ-309 light output data from neutrons depositing 1.15 MeV to 5.15 MeV on hydrogen wereanalyzed using empirical models as well as semi-empirical models based on the work of Birks and Voltz. Although all tested models fit the experimental light output data well in the measured range, the models were observed to diverge in low-energy extrapolation. The modelswerethen tested by comparing a measurement and MCNPX-PoliMi simulation of an EJ-309 detector response to fast neutrons from a 252 Cf spontaneous fission source. The agreement between the measured and simulated pulse height distributionsvaried significantly depending on the light output model used. The best agreement between simulated and measured neutron pulse height distributionswas achieved by using the Birks model. The bin-by-bin agreement was better than 5% over the range 0.08 to 2.18 MeVee, and better than 10% from 2.18 to 3.13 MeVee. The integral count rate over the range 0.08 to 3.14 MeVee differed by less than 1% in absolute units. 1.0 Introduction The IAEA is interested in high-fidelity Monte Carlo modeling of detector technologies for international safeguards applications[1]. Several ongoingsafeguards projects employ organic scintillators as fast neutron detectors, such as theLiquid-Scintillator Neutron Coincidence Collar (LS-NCC) [1],the Fast Neutron Multiplicity Counter (UM-FNMC) [2,3],radiation portal monitors (RPMs)[4,5], and the Dual Particle Imager (DPI) [6-8]. Organic scintillators are also frequently employed in a wide variety of applications including, but not limited to, nuclear physics [9], material characterization [6,3,10,2], imaging [6-8], and nuclear medicine[11,12].

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“…In this work, the proton and carbon light yield of the EJ-309 and EJ-204 organic scintillators were measured simultaneously over a range of recoil energies. The EJ-309 liquid scintillator has pulse shape discrimination (PSD) properties [19] and was selected as a standard of reference given the relatively large body of work characterizing the proton light yield of this medium [20][21][22][23][24][25][26][27][28][29][30]. The EJ-204 plastic scintillator has a rapid temporal response and long attenuation length [31], and it has been identified as a prime candidate for use in cutting-edge compact neutron imaging systems [32].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous measurement of organic scintillator response to carbon and proton recoils

Laplace,

Goldblum,

Manfredi

et al. 2021

Preprint

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Background: Organic scintillators are widely used for neutron detection in both basic nuclear physics and applications. While the proton light yield of organic scintillators has been extensively studied, measurements of the light yield from neutron interactions with carbon nuclei are scarce.Purpose: Demonstrate a new approach for the simultaneous measurement of the proton and carbon light yield of organic scintillators. Provide new carbon light yield data for the EJ-309 liquid and EJ-204 plastic organic scintillators.Method: A 33 MeV 2 H + beam from the 88-Inch Cyclotron at Lawrence Berkeley National Laboratory was impinged upon a 3-mm-thick Be target to produce a high-flux, broad-spectrum neutron beam. The double timeof-flight technique was extended to simultaneously measure the proton and carbon light yield of the organic scintillators, wherein the light output associated with the recoil particle was determined using np and nC elastic scattering kinematics. Results:The proton and carbon light yield relations of the EJ-309 liquid and EJ-204 plastic organic scintillators were measured over a recoil energy range of approximately 0.3 to 1 MeV and 2 to 5 MeV, respectively for EJ-309, and 0.2 to 0.5 MeV and 1 to 4 MeV, respectively for EJ-204.Conclusions: These data provide new insight into the ionization quenching effect in organic scintillators and key input for simulation of the response of organic scintillators for both basic science and a broad range of applications.

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Simulated Neutron Response Functions of Phoswich-Type Neutron Detector and Thin Organic Liquid Scintillator

Cited by 10 publications

References 11 publications

Proton light yield in organic scintillators using a double time-of-flight technique

Proton light yield in organic scintillators using a double time-of-flight technique

Evaluation of neutron light output response functions in EJ-309 organic scintillators

Simultaneous measurement of organic scintillator response to carbon and proton recoils

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