Radiation imaging with a rotational modulation collimator (RMC) coupled to a Cs2LiYCl6:Ce (CLYC) detector

Kim, Hyun Suk; Ye, Sung-Joon; Shin, Youngjun; Lee, Gyemin; Kim, Geehyun

doi:10.3938/jkps.69.1644

Cited by 13 publications

(23 citation statements)

References 5 publications

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“…Furthermore, moderation of neutrons emitted from 252 Cf showed similarities between the simulation and the experiment, in terms of their relative ratios depending on the thickness of the PE moderator. Validation of the simulation results in overall trend of the CLYC detector behavior will provide the fundamental basis and validity of follow-up Monte Carlo simulation studies for the development of our dualparticle imager using a rotational modulation collimator [6][7].…”

Section: Resultsmentioning

confidence: 87%

“…Precise modeling of the CLYC detector system is important, in regards of the subsequent development of the dualparticle imager based on the CLYC detector system [7]. Based on this work, we plan to perform Monte Carlo simulations on RMC to obtain simulated modulation patterns, depending on the source configuration, which will be used to reconstruct the image of the radioactive source distribution.…”

Section: Modeling Of the Clyc Detector Systemmentioning

confidence: 99%

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Characterization of a CLYC Detector and Validation of the Monte Carlo Simulation by Measurement Experiments

Kim

Smith²,

Koslowsky³

et al. 2017

J Radiat Prot Res

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Background: Simultaneous detection of neutrons and gamma rays have become much more practicable, by taking advantage of good gamma-ray discrimination properties using pulse shape discrimination (PSD) technique. Recently, we introduced a commercial CLYC system in Korea, and performed an initial characterization and simulation studies for the CLYC detector system to provide references for the future implementation of the dual-mode scintillator system in various studies and applications. Materials and Methods:We evaluated a CLYC detector with 95% 6 Li enrichment using various gamma-ray sources and a 252 Cf neutron source, with validation of our Monte Carlo simulation results via measurement experiments. Absolute full-energy peak efficiency values were calculated for gamma-ray sources and neutron source using MCNP6 and compared with measurement experiments of the calibration sources. In addition, behavioral characteristics of neutrons were validated by comparing simulations and experiments on neutron moderation with various polyethylene (PE) moderator thicknesses. Results and Discussion:Both results showed good agreements in overall characteristics of the gamma and neutron detection efficiencies, with consistent ~20% discrepancy. Furthermore, moderation of neutrons emitted from 252 Cf showed similarities between the simulation and the experiment, in terms of their relative ratios depending on the thickness of the PE moderator.Conclusion: A CLYC detector system was characterized for its energy resolution and detection efficiency, and Monte Carlo simulations on the detector system was validated experimentally. Validation of the simulation results in overall trend of the CLYC detector behavior will provide the fundamental basis and validity of follow-up Monte Carlo simulation studies for the development of our dual-particle imager using a rotational modulation collimator.

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Section: Resultsmentioning

confidence: 87%

Section: Modeling Of the Clyc Detector Systemmentioning

confidence: 99%

Characterization of a CLYC Detector and Validation of the Monte Carlo Simulation by Measurement Experiments

Kim

Smith²,

Koslowsky³

et al. 2017

J Radiat Prot Res

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“…This shows that PSD performance can be substantially affected by the determination of the threshold. Optimized variables for two digital PSD methods can provide reference values for developing a fast neutron/ gamma-ray dual-particle imager with the stilbene scintillator and the EJ-301 liquid scintillator as feasibility discussed in one of previous studies [10][11][12].…”

Section: Jrprmentioning

confidence: 99%

“…Depending on the time width of typical pulse signals being processed, one can achieve processible count rate of pulses up to 500 kHz, which exhibits an advantage over previous analog PSD systems. As a fundamental step for the development of a fast neutron/gamma-ray dual-particle imager [10][11][12], we took an initiative approach to implement a fast neutron/gammaray dual-particle measurement system with digital PSD using the stilbene crystal from Inrad Optics, and the EJ-301 liquid scintillator from ELJEN TECHNOLOGY combined with DT5730 of CAEN. In the development of the fast neutron/ gamma-ray dual-particle imager, we take a single non-position-sensitive detector-based approach to obtain temporal modulation patterns determined by the rotating collimators.…”

Section: Introductionmentioning

confidence: 99%

Digital n-γ Pulse Shape Discrimination in Organic Scintillators with a High-Speed Digitizer

2019

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Background:As neutron fields are always accompanied by gamma rays, it is essential to distinguish neutrons from gamma rays in the detection of neutrons. Neutrons and gamma rays can be separated by pulse shape discrimination (PSD) methods. Recently, we performed characterization of a stilbene scintillator detector and an EJ-301 liquid scintillator detector with a highspeed digitizer DT5730 and investigated optimized PSD variables for both detectors. This study is for providing a basis for developing fast neutron/gamma-ray dual-particle imager. Materials and Methods:We conducted PSD experiments using stilbene scintillator and EJ-301 liquid scintillator and evaluated neutron and gamma ray discriminability of each PSD method with a 137 Cs gamma source and a 252 Cf neutron source. We implemented digital signal processing techniques to apply two PSD methods -the charge comparison (CC) method and the constant time discrimination (CTD) method -to distinguish neutrons from gamma rays. We tried to find optimized PSD variables giving the best discriminability in a given experimental condition. Results and Discussion:For the stilbene scintillator detector, the charge comparison method and the constant time discrimination method both delivered the PSD FOM values of 1.7. For the EJ-301 liquid scintillator detector, both PSD methods delivered the PSD FOM values of 1.79. With the same PSD variables, PSD performance was excellent in 300 ± 100 keVee, 500 ± 100 keVee, and 700 ± 100 keVee energy regions. This result shows that we can achieve an effective discrimination of neutrons from gamma rays using these scintillator detector systems. Conclusion:We applied both PSD methods to a stilbene and a liquid scintillator and optimized the PSD performance represented by FOM values. We observed a good separation performance of both scintillators combined with a high-speed digitizer and digital PSD. These results will provide reference values for the dual-particle imager we are developing, which can image both fast neutrons and gamma rays simultaneously.

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“…In terms of the simplicity and cost of the system, the RMC technique could be an attractive candidate. This technique, which is based on temporal modulation of incident radiation signals, does not require position-sensitive radiation detectors and thus, excludes the necessity of complex electronics and requires less fabrication cost [3][4][5][6][7]. This imager estimates the radioactive source distribution from the pattern morphology determined by the system configuration of the RMC imager and by the individual source location.…”

Section: Introductionmentioning

confidence: 99%

Design and Fabrication of CLYC-Based Rotational Modulation Collimator (RMC) System for Gamma-Ray/Neutron Dual-Particle Imager

Kim

Lee

Choi³

et al. 2021

J Radiat Prot Res

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Background: This work aims to develop a new imaging system based on a pulse shape discrimination-capable Cs2LiYCl6:Ce (CLYC) scintillation detector combined with the rotational modulation collimator (RMC) technique for dual-particle imaging.Materials and Methods: In this study, a CLYC-based RMC system was designed based on Monte Carlo simulations, and a prototype was fabricated. Therein, a rotation control system was developed to rotate the RMC unit precisely, and a graphical user interface-based software was also developed to operate the data acquisition with RMC rotation. The RMC system was developed to allow combining various types of collimator masks and detectors interchangeably, making the imaging system more versatile for various applications and conditions.Results and Discussion: Operational performance of the fabricated system was studied by checking the accuracy and precision of the collimator rotation and obtaining modulation patterns from a gamma-ray source repeatedly.Conclusion: The prototype RMC system showed reliability in its mechanical properties and reproducibility in the acquisition of modulation patterns, and it will be further investigated for its dual-particle imaging capability with various complex radioactive source conditions.

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Radiation imaging with a rotational modulation collimator (RMC) coupled to a Cs2LiYCl6:Ce (CLYC) detector

Cited by 13 publications

References 5 publications

Characterization of a CLYC Detector and Validation of the Monte Carlo Simulation by Measurement Experiments

Characterization of a CLYC Detector and Validation of the Monte Carlo Simulation by Measurement Experiments

Digital n-γ Pulse Shape Discrimination in Organic Scintillators with a High-Speed Digitizer

Design and Fabrication of CLYC-Based Rotational Modulation Collimator (RMC) System for Gamma-Ray/Neutron Dual-Particle Imager

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