Physics
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999nimpa.422..139d&link_type=abstract
Nuclear Instruments and Methods in Physics Research Section A, Volume 422, Issue 1-3, p. 139-143.
Physics
1
Scientific paper
The development and construction of plastic scintillators of large volume, to be used as Compton suppressors in the MASCO telescope, are described. We also outline some characteristics of MASCO, which is a coded-mask gamma-ray imaging telescope with an angular resolution of 14 in a 14/° (diameter, conical) field-of-view with a sensitivity of 3.92, 1.33 and 1.18×10-5photonscm-2s-1keV- 1 in 0.05, 0.30 and 1MeV respectively, for an integration time of 6h and a residual atmosphere of 3.5gcm-2. The Compton supressor described contains 12 modules of plastic scintillators, each one built as a trapezoidal prism (1m of length) with a cross section with sides of /14×22cm2 and 15cm thick (27l of volume). Measurements of transmittance, luminescence, X-ray fluorescence and light output were carried out with the purpose of characterizing the detector. We present the estimates of the imaging sensitivity and the sensitivity for pulsed sources of the MASCO instrument.
Braga Jaoa
Costa P. d. Jr. N.
D'Amico Flavio
Hamada Mitsuru
Mauro Vieira J.
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