Position sensitive x- and gamma-ray scintillator detector for new space telescopes

AbstractAn important region of the electromagnetic spectrum for astrophysics is the hard X- and gamma ray band between 10 keV and a few MeV, where several processes occur in a wide variety of objects and with different spatial distribution and time scales. In order to fulfill the observational requirements in this energy range and taking into account the opportunities given by small/medium size missions (e.g. on the ISS), we have proposed a compact, wide field camera based on a thick (1 cm) position sensitive CdTe detector (PSD). The detector is made of an array of 128×96 CdTe microspectrometers with a pixel size of 2×2 mm2. The basic element of the PSD is the linear module that is an independent detection unit with 32 CdTe crystals and monolithic front-electronics (ASIC) supported by a thin (300 μm) ceramic layer. The expected performance of the PSD over the operative energy range and some of the required ASIC functionality are presented and discussed.

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Experimental Study of Using a 3-D Position Sensitive CdZnTe Detector for Proton Beam Range Verification

10.36227/techrxiv.13717834.v1 ◽

2021 ◽

Author(s):

Valerie Nwadeyi ◽

Paul maggi ◽

Zhong He ◽

Jerimy Polf

Keyword(s):

Proton Beam ◽

Expectation Maximization ◽

Gamma Ray ◽

Prompt Gamma ◽

Cdznte Detector ◽

Maximum Likelihood Expectation Maximization ◽

Gamma Ray Imaging ◽

Position Sensitive ◽

Beam Range ◽

Range Verification

This manuscript discusses the use of a large volume array CZT detector for experimental prompt gamma-ray imaging. Namely, the 718 keV and the 4.44 MeV photopeaks produced from proton-carbon interactions are imaged using maximum likelihood expectation maximization (MLEM). Various proton beam irradiations are used to characterize the feasibility of using both photopeaks for beam range verification.

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Some Interesting Work on Capillary Glass Detectors

Innovative Applications and Developments of Micro-Pattern Gaseous Detectors - Advances in Chemical and Materials Engineering ◽

10.4018/978-1-4666-6014-4.ch006 ◽

2014 ◽

pp. 103-113

Keyword(s):

Gamma Ray ◽

X Rays ◽

Glass Capillary ◽

Large Area ◽

Vacuum Technology ◽

Gas Atmosphere ◽

Gamma Ray Imaging ◽

Position Sensitive ◽

Primary Electrons ◽

Glass Detectors

In this chapter, the progress of the development of glass capillary plates is described. In some applications, capillary plates have advantages over GEM or other gaseous detectors. For example, they are compatible with vacuum technology allowing them to be used in sealed gaseous detectors. Prototypes of capillary plates combined with photocathodes sensitive to ultraviolet and visible light were the first to be developed and successfully tested. These detectors resemble vacuum imaging microchannel plates, widely used in many applications. However, the glass capillary plates operate in gas atmosphere and in avalanche mode. This offers a possibility to build large area position-sensitive photomultipliers since at atmospheric pressure there are no serious mechanical constrains on the window. Since glass has a high density, the capillary plate can also be used as efficient convertors of X-rays, and be used at the same time as a multiplication structure for the created primary electrons. Such a device is attractive for X-ray and gamma ray imaging and the first successful tests of a prototype of such a detector are described.

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