Measurement of gamma quantum interaction point in plastic scintillator with WLS strips

Abstract

We demonstrated the feasibility of measuring the axial coordinate of a gamma quantum interaction point in a plastic scintillator bar via the detection of scintillation photons escaping from the scintillator with an array of wavelength-shifting (WLS) strips. Using a test set-up comprising a BC-420 scintillator bar and an~array of sixteen BC-482A WLS strips we achieved a spatial resolution of~5\,mm~($\sigma$) for annihilation photons from a ${}^{22}$Na isotope. The studied method can be used to improve the spatial resolution of a plastic-scintillator-based PET scanner which is being developed by the J-PET collaboration.

13 pages, 8 figures; Submitted to Nuclear Instruments and Methods in Physics Research Section A

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• Synchronisation and calibration of the 24-modules J-PET prototype with 300~mm axial field of view
• Comparative studies of plastic scintillator strips with high technical attenuation length for the total-body J-PET scanner
• TOF MLEM Adaptation for the Total-Body J-PET with a Realistic Analytical System Response Matrix
• Development of J-PEM for breast cancer detection and diagnosis using positronium imaging
• Introduction of total variation regularization into filtered backprojection algorithm
• Hit-time and hit-position reconstruction in strips of plastic scintillators using multi-threshold readouts
• Measurement of the CKM angle ${\varphi }_3$ at Belle II
• Search for the Charge symmetry forbidden decays of electron-positron bound state using the J-PET detector