Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ssi.....3..491m&link_type=abstract
Space Science Instrumentation, vol. 3, Dec. 1977, p. 491-506.
Astronomy and Astrophysics
Astronomy
4
Balloon-Borne Instruments, Collimators, Electric Switches, Scintillation Counters, X Ray Astronomy, Background Radiation, Cesium Iodides, Photosensitivity, Sodium Compounds, X Ray Telescopes
Scientific paper
The design and performance of a phoswich type scintillation detector system having 34 sq cm effective collecting area and a sensitivity of 3 x 10 to the -5th power photons/sq cm/s/keV for balloon-borne cosmic X-ray source observations are discussed. The various shield anticoincidence systems are evaluated for effectiveness in reduction of the system background. The total background of nominally 4 x 10 to the -4th power counts/sq cm/s/keV is analyzed and found to consist of aperture flux, K-escape X-rays from the shielding, leakage, and degradation of gamma-rays through the shielding, and several particle induced effects. The background analysis suggests an ultimate practical upper limit of about 8 x 10 to the -5th power counts/sq cm/s/keV might be attainable beyond which further sensitivity improvements will require increased collecting area or a basically differing design approach.
Matteson James L.
Nolan Patrick Lee
Paciesas William Simon
Pelling Michael R.
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