A Position Sensitive $\gamma $-Ray Scintillator Detector With Enhanced Spatial Resolution, Linearity, and Field of View

Abstract

The performance of a position sensitive gamma-ray scintillator detector (PSD) is described. This PSD is based on a lutetium yttrium oxyorthosilicate (LYSO) crystal read out by a crossed-wire anode position sensitive photomultiplier tube (PSPMT). The main difference with respect to similar existing devices is the individual multi-anode readout (IMAR) approach that is followed here. This method allows to exploit better the intrinsic characteristics of the PSPMT, thus yielding better linearity, improved spatial resolution, and a larger field of view. The new detector is intended for the characterization of 3-D position sensitive germanium detectors.

Towards a deep characterization of a 64-fold-pixelated position sensitive detector for a new γ-scanning system of HPGe segmented detectors

“…This spatial resolution is 5% better than other systems already working with the same aim of SALSA [13] and it is around 30% more than conventional…”

Characterisation of a symmetric AGATA detector using the imaging scanning technique

“…It is based on the pulse shape comparison scan (PSCS) principle [31] with a positron annihilation Compton scattering imaging technique [21]. To this aim, a point-like 300 kBq 22 Na positron source is placed between the HPGe detector and a well characterised position sensitive scintillation detector (PSD) [32], which was specifically developed for the present application. The detector is described in detail in Ref.…”

“…The detector is described in detail in Ref. [32] where its performance, in terms of spatial resolution and Peak/Total is also reported. The PSD and the approach followed in the present work are similar to those described in our previous publication [21] for the characterisation of a non-segmented planar HPGe detector.…”

“…The AGATA-PSD coincidence data flow was about 7 MB/s for a 22 Na source activity of 300 kBq. The Multi-Branch System (MBS) [37] of GSI is used to read the digitised signals and the PSD electronics [32]. The Go4 software [38] is used as a graphical interface for the online analysis of the data.…”

“…The imaging method followed here for obtaining these spatial representations is the one described in Ref. [32]. Fig.…”