Optical simulation and experimental measurement of gamma ray energy spectrum of plastic scintillators with different sizes

Authors

Abstract

The application of large plastic scintillators is widely increasing in the different areas of industry, medicine and security due to technical and economic advantages. One of the main disadvantages of these detectors is the unknown position of Compton edge at gamma ray spectrum. In this research, GEANT4/GATE code has been used to simulate the gamma ray spectrum for different volumes of large plastic scintillator. According to these simulations, the dependence of the Compton edge position, energy resolution at Compton edge and efficiency of the optical photon collection to the scintillator dimensions has been investigated. The simulations showed that the Compton edge position with respect to local maximum at Compton continues strongly depends on the scintillator dimensions. These results were verified by experimental spectrometry.

Keywords


[1] G.F. Knoll. Radiation Detection and Measurement, John Wiley & Sons, (2010). [2] N. Tsoulfanidis. Measurement and Detection of Radiation, CRC press, (2010). [3] V.M. Varier. Nuclear Radiation Detection, Measurements and Analysis, Alpha Science, (2009). [4] M.A. Alkıs. Threat of Nuclear Terrorism: Towards an Effective Nuclear Security Regime, Sosyal Bilimler Enstitüsü, (2017). [5] V. Antonuccio, M. Bandieramonte, U. Becciani, D. L. Bonanno, G. Bonanno, D. Bongiovanni, P.G. Fallica, S. Garozzo, A. Grillo, P.La Rocca and E. Leonora.. The Muon Portal Project: Design and Construction of a Scanning Portal based on Muon Tomography, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 845 (2017) 322–325. [6] P. Ghorbani, D. Sardari, R. Azimirad and M. Hosntalab. Assessment of Optical Photon Collection in a Large Plastic Scintillator using GEANT4-GATE Code, Optik-International Journal for Light and Electron Optics, 158 (2018) 305–311. [7] K. Guthe. The Global Nuclear Detection Architecture and the Deterrence of Nuclear Terrorism, Comparative Strategy, 33 (2014) 424–450. [8] G. Dietze. Energy Calibration of NE-213 Scintillation Counters by -Rays, IEEE Transactions on Nuclear Science, 26 (1979) 398–402. [9] P. Kuijper, C. Tiesinga and C. Jonker. Light Attenuation in Scintillation Counters, Nuclear Instruments and Methods, 42 (1) (1966) 56–60. [10] L. Beghian, S. Wilensky and W. Burrus. A Fast Neutron Spectrometer Capable of Nanosecond Time Gating, Nuclear Instruments and Methods, 35(1) (1965) 34–44. [11] A. Bertin, A. Vitale and A. Placci. A System of Large Liquid Scintillation Counters used with a Simplified Neutron-Gamma Discrimination Technique, Nuclear Instruments and Methods, 68(1) (1969) 24–38. [12] R. Honecker and H. Grässler. Detection Efficiency of a Plastic Scintillator for Neutrons between 0.2 and 3 MeV, Nuclear Instruments and Methods, 46(2) (1967) 282–288. [13] H. Knox and T. Miller. A Technique for Determining Bias Settings for Organic Scintillators, Nuclear Instruments and Methods, 101(3) (1972) 519–525. [14] M.J. Safari, F. Abbasi Davani, H. Afarideh, S. Jamili and E. Bayat. Discrete Fourier Transform Method for Discrimination of Digital Scintillation Pulses in Mixed Neutron-Gamma Fields. IEEE Transactions on Nuclear Science, 63(1) (2016) 325–332. [15] J. Nilsson and M. Isaksson. The Design of a Low Activity Laboratory Housing a Whole Body Counter consisting of Large Plastic Scintillators and the Work towards a Flexible Monte Carlo Calibration, Progress in Nuclear Science and Technology,4 (2014) 427–431. [16] J. Nilsson and M. Isaksson. A Monte Carlo Calibration of a Whole Body Counter sing the ICRP Computational Phantoms, Radiation Protection Dosimetry, 163(4) (2014) 458–467. [17] J. Nilsson, V. Cuplov and M. Isaksson. Identifying Key Surface Parameters for Optical Photon Transport in GEANT4/GATE Simulations. Applied Radiation and Isotopes, 103(2015) 15–24.