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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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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 high-speed 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 $300{\pm}100keVee$, $500{\pm}100keVee$, and $700{\pm}100keVee$ 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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참고문헌 (20)
참고문헌 신청
Knoll GF / 2010 / Radiation detection and measurement / John Wiley & Sons
Brooks F / 1979 / Development of organic scintillators / Nucl. Instrum. Methods 162(1-3):477~505
Pozzi S / 2009 / Pulse-height distributions of neutron and gamma rays from plutonium-oxide samples / Nucl. Instrum. Methods Phys. Res., Sect. A 608(2):310~315
Carman L / 2013 / The effect of material purity on the optical and scintillation properties of solutiongrown trans-stilbene crystals / J. Cryst. Growth 368:56~61
Plischke P / 1976 / An electronic circuit for pulse shape discrimination in organic scintilla-tors / Nucl. Instrum. Methods 136(3):579~583
Brooks F / 1979 / Development of organic scintillators / Nucl. Instrum. Methods 162(1-3):477~505
Pozzi S / 2009 / Pulse-height distributions of neutron and gamma rays from plutonium-oxide samples / Nucl. Instrum. Methods Phys. Res., Sect. A 608(2):310~315
Carman L / 2013 / The effect of material purity on the optical and scintillation properties of solutiongrown trans-stilbene crystals / J. Cryst. Growth 368:56~61
Plischke P / 1976 / An electronic circuit for pulse shape discrimination in organic scintilla-tors / Nucl. Instrum. Methods 136(3):579~583
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