Characteristics of 1D CRL position sensitive SiPM and its performance in acquiring 2D radiation imaging

The characteristics of one-dimensional (1D) position sensitive SiPM with an intrinsic continuous cap resistive layer (CRL) and its performance in acquiring two-dimensional (2D) radiation imaging are reported in this paper. The device, with an active size of 6.14 mm × 6.14 mm, demonstrated the position measurement error of 32.0 ± 24.0 µm without correction, which accounted for 0.5% of the length of the SiPM at a mean response photoelectron number around 230 and the reverse bias voltage of 40 V. Under the same condition, it demonstrated a position resolution of 128.7 ± 20.1 µm and a time resolution of 96.0 ± 33.2 ps. A 3D scintillation detector for acquiring 2D radiation imaging with depth information of interaction (DOI) is proposed by implementing two 1D CRL SiPMs in a perpendicular orientation on the two ends of a scintillator. Using this configuration, the 2D imaging of a pixelated 10 × 10 lutetium yttrium orthosilicate (LYSO) array, with each element having a volume of 0.52 mm × 0.52 mm × 20 mm, was successfully resolved by utilizing the natural radioactive radiation of lutetium element in LYSO without distortions at the edges and corners.