The University of Southampton
University of Southampton Institutional Repository

A position-sensitive detector for hard X-ray astronomy

A position-sensitive detector for hard X-ray astronomy
A position-sensitive detector for hard X-ray astronomy

Astronomy in the hard X-ray region of the electromagnetic spectrum (20 - 250 keV) provides an essential insight into some of the most energetic processes occurring both in our galaxy and beyond. The current status of hard X-ray astronomy is reviewed, and conclusions concerning the required performance of the next generation of imaging telescopes are reached. Imaging in this waveband is made difficult by; the penetrating nature of the X- ray photons, which makes the use of conventional optics impossible. The techniques applicable to hard X-ray imaging are reviewed, with the emphasis being placed upon modulation imaging in which specially designed apertures are used to modulate the incoming source flux according to the position of the source within the field of view. Hard X-ray detection techniques suitable for use with modulation imagers are reviewed. The recent development of position-sensitive photomultipliers, which are now available in a variety of configurations, has created a new possibility for the construction of hard X-ray detectors with the spatial resolution necessary to achieve the goal of arc minute imaging with a coded aperture imaging system. One particular type of position-sensitive photomultiplier has been evaluated in conjunction with a thin NaI(Tl) scintillation crystal to examine its potential in a number of X-ray imaging roles. The basic performance of the photomultiplier is assessed, and a method for using such a detector as a hard X-ray imager is developed. The intrinsic imaging capability of the detector may be relevant in applications where a relatively small detection area is sufficient, but for use in hard X-ray astronomy where the source flux is dominated by the background, a much larger detection area is essential. Methods for constructing large area detectors using position-sensitive photomultipliers are considered, as is the possibility of a position-sensitive phoswich based on the same techniques. Other applications of a compact hard X-ray imaging system are also considered.

University of Southampton
Bird, Antony John
Bird, Antony John

Bird, Antony John (1990) A position-sensitive detector for hard X-ray astronomy. University of Southampton, Doctoral Thesis.

Record type: Thesis (Doctoral)

Abstract

Astronomy in the hard X-ray region of the electromagnetic spectrum (20 - 250 keV) provides an essential insight into some of the most energetic processes occurring both in our galaxy and beyond. The current status of hard X-ray astronomy is reviewed, and conclusions concerning the required performance of the next generation of imaging telescopes are reached. Imaging in this waveband is made difficult by; the penetrating nature of the X- ray photons, which makes the use of conventional optics impossible. The techniques applicable to hard X-ray imaging are reviewed, with the emphasis being placed upon modulation imaging in which specially designed apertures are used to modulate the incoming source flux according to the position of the source within the field of view. Hard X-ray detection techniques suitable for use with modulation imagers are reviewed. The recent development of position-sensitive photomultipliers, which are now available in a variety of configurations, has created a new possibility for the construction of hard X-ray detectors with the spatial resolution necessary to achieve the goal of arc minute imaging with a coded aperture imaging system. One particular type of position-sensitive photomultiplier has been evaluated in conjunction with a thin NaI(Tl) scintillation crystal to examine its potential in a number of X-ray imaging roles. The basic performance of the photomultiplier is assessed, and a method for using such a detector as a hard X-ray imager is developed. The intrinsic imaging capability of the detector may be relevant in applications where a relatively small detection area is sufficient, but for use in hard X-ray astronomy where the source flux is dominated by the background, a much larger detection area is essential. Methods for constructing large area detectors using position-sensitive photomultipliers are considered, as is the possibility of a position-sensitive phoswich based on the same techniques. Other applications of a compact hard X-ray imaging system are also considered.

Text
29938.pdf - Version of Record
Available under License University of Southampton Thesis Licence.
Download (11MB)

More information

Published date: 1990

Identifiers

Local EPrints ID: 458346
URI: http://eprints.soton.ac.uk/id/eprint/458346
PURE UUID: ea394d4a-5651-4585-b9c1-36f9ab3c85f7

Catalogue record

Date deposited: 04 Jul 2022 16:47
Last modified: 04 Jul 2022 17:23

Export record

Contributors

Author: Antony John Bird

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×