Imager prototype for gamma-ray astronomy: functional performance

Author

Labanti, C. ; Rossi, E. ; Schiavone, F. ; Spizzichino, A. ; Traci, A. ; Corba, M. ; Quadrini, M.E. ; Bird, A.J. ; Carter, T. ; Gomm, A.J.M.

Author_Institution

Istituto TESR CNR, Bologna, Italy

Volume

40

Issue

4

fYear

1993

fDate

8/1/1993 12:00:00 AM

Firstpage

879

Lastpage

881

Abstract

A prototype module for the imager on INTEGRAL (International Gamma Ray Astrophysics Laboratory) has been constructed for laboratory and space tests by means of a balloon launch. The main detector is designed to operate in the energy range from 0.25 to 10 MeV and consists of 96 CsI(Tl) bars, each 15 cm in length. At 662 keV, the typical performance is 1.5 cm full width half maximum (FWHM) spatial resolution (1 σ) along the bar, and 15% energy resolution. The work carried out during instrument construction and calibration is described, with emphasis on the simple method which has been implemented to normalize the nonuniformity of the performance of the bars. The measurements of energy threshold and energy and position resolution are presented and discussed

Keywords

astronomical instruments; calibration; gamma-ray astronomy; image sensors; scintillation counters; 0.25 to 10 MeV; 15 cm; 662 keV; CsI(Tl) bars; CsI:Tl; INTEGRAL; International Gamma Ray Astrophysics Laboratory; balloon launch; calibration; energy resolution; energy threshold; functional performance; gamma-ray astronomy; imager prototype; instrument construction; laboratory tests; nonuniformity; position resolution; prototype module; space tests; spatial resolution; Astronomy; Astrophysics; Bars; Detectors; Energy resolution; Instruments; Laboratories; Prototypes; Spatial resolution; Testing;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.256677

Filename

256677