Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994spie.2280..127t&link_type=abstract
Proc. SPIE Vol. 2280, p. 127-133, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy V, Oswald H. Siegmund; John V. Vallerg
Astronomy and Astrophysics
Astronomy
Scientific paper
A large-volume (3 liters), xenon-filled, gas proportional scintillation counter with a curved grid and focusing rings was developed and tested with hard X-rays. The efficiency at 60 keV was calculated to be 64%. The experimentally measured energy resolution was observed to decrease from 6 to 5% when the X-ray energy was increased from 22.1 to 59.6 keV. Spectra are presented for the (superscript 241)Am gamma rays and lanthanum K(subscript (alpha) ) and B(subscript (beta) ) X-rays. Spectra for the same K lines of erbium, praseodymium and tin are also presented for the detector with and without the focusing rings. These spectra show that the focusing rings increase the detection efficiency and improve the energy resolution. This effect is attributed to the increased electron collection in the scintillation region, to faster pulse rise times and to reduced electron attachment to impurities.
Conde Carlos A.
Dos Santos Joaquim M.
Tavora Luis M.
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