Abstract
γ-ray spectrometry is a well-known technique in environmental radioactivity measurements where easily handled systems are needed. Scintillators coupled to a photomultiplier tube (PMT), are typically favoured over solid-state detectors as mobile spectrometers. Replacing PMT with position sensitive devices represents an innovative solution that provides the evaluation of the interaction point of the incident radiation. The knowledge of spectrometry as a function of the depth of interaction (DoI) assures a better understanding of the spectrum and a more reliable identification of the source. In this paper, the efficiency of a simple DoI estimator has been studied using a CRY018 monolithic crystal coupled to a multi-anode photomultiplier tube. The DoI estimator has been evaluated studying charge distributions and the dependency of spectrometric properties on the DoI has been qualitatively analyzed. The estimator has shown to be highly sensitive to the DoI, enabling a better understanding of the internal interaction processes of light and an efficient rejection of the background component on the spectra. The novelty of this work lies in the application of the DoI selection in spectrometry made available by the use of MAPMT. The proposed method is practical since it does not require complicated hardware solutions or complex computational procedures.
Highlights
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The efficiency of a simple depth of interaction (DoI) estimator has been studied using a CRY018 monolithic crystal coupled to a multi-anode photomultiplier tube
The novelty of this work lies in the application of the DoI selection in spectrometry made available by the use of multi anode photomultiplier tube (MAPMT)
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The most commonly used systems are easy to handle and to be carried by humans [1,2,3], assembled on air vehicles [4], robotic instruments [5], or dive into deep oceans aboard marine submersibles [6,7,8] Facing this scenario, different types of detectors can be considered, such as scintillators (i.e., NaI:Tl) or solid-state detectors (i.e., HPGe), coupled to integrated electronic modules for data acquisition or custom-made designs to accommodate special needs. Recent advances in the development of semiconductor photodiodes have made silicon photomultiplier (SiPM) more suitable in some applications (i.e., when the position information is needed or in the presence of a magnetic field) These solid-state detectors are an array of many small-dimension avalanche photodiodes operated in Geiger mode. Its hygroscopic nature requires a bulky housing which limits the realisation of compact and handled systems
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