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Proceedings Paper

Imager for gamma-ray astronomy: balloon prototype
Author(s): Guido Di Cocco; Claudio Labanti; Giuseppe Malaguti; Elio Rossi; Filomena Schiavone; Aldo Spizzichino; Alessandro Traci; Antony J. Bird; T. Carter; Anthony J. Dean; A. J. M. Gomm; K. J. Grant; Massimiliano Corba; E. M. Quadrini; Massimo Rossi; Gabriele E. Villa; Bruce Miles Swinyard
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Paper Abstract

A novel low energy astronomical gamma-ray detector is being developed for future satellite missions. Recent advances in the technology of photodiodes and small, low noise amplifier circuits have meant that more compact detectors can be assembled in a complex array in order to give a 3-D position reconstruction capability. In a mask-detector telescope this capability is potentially very useful since it allows the reconstruction of the path of the incident gamma rays making it valuable both for imaging and background rejection. A small prototype of a 3-D detector has been realized for test in a balloon mission. The detector is based on a 12 X 8 array of position sensitive CsI(T1) bars, typically 15 cm long with 1.3 X 1.3 cm cross section, viewed at each end by photodiodes. The detector includes four 1.3 X 1.3 X 2.5 cm CsI(T1) scintillators located above the main array in order to evaluate the low energy response of the imager. The detector constitutes an active block of 2400 cm3 of scintillator that can operate in the 0.2 - 10 MeV energy range. The energy resolution is 13% at 662 keV and the positional resolution is of the order of 1.5 cm in each dimension. An active shield of CSI(T1) and plastic scintillators surrounds the bar detector. The overall experiment is briefly described in general and preliminary results of laboratory tests are presented.

Paper Details

Date Published: 1 October 1991
PDF: 11 pages
Proc. SPIE 1549, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy II, (1 October 1991); doi: 10.1117/12.48331
Show Author Affiliations
Guido Di Cocco, Istituto TESRE/CNR (Italy)
Claudio Labanti, Istituto TESRE/CNR (Italy)
Giuseppe Malaguti, Istituto TESRE/CNR and Univ. di Bologna (Italy)
Elio Rossi, Istituto TESRE/CNR (Italy)
Filomena Schiavone, Istituto TESRE/CNR (Italy)
Aldo Spizzichino, Istituto TESRE/CNR (Italy)
Alessandro Traci, Istituto TESRE/CNR (Italy)
Antony J. Bird, Univ. of Southampton (United Kingdom)
T. Carter, Univ. of Southampton (United Kingdom)
Anthony J. Dean, Univ. of Southampton (United Kingdom)
A. J. M. Gomm, Univ. of Southampton (United Kingdom)
K. J. Grant, Univ. of Southampton (United Kingdom)
Massimiliano Corba, IFCTR/CNR (United States)
E. M. Quadrini, IFCTR/CNR (Italy)
Massimo Rossi, IFCTR/CNR (Italy)
Gabriele E. Villa, IFCTR/CNR (Italy)
Bruce Miles Swinyard, Rutherford Appleton Lab. (United Kingdom)

Published in SPIE Proceedings Vol. 1549:
EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy II
Oswald H. W. Siegmund; Richard E. Rothschild, Editor(s)

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