IEEE Nuclear Science Symposium/Medical Imaging Conference (NSS/MIC), Norfolk, England, 10 - 16 November 2002, pp.619-623
We performed studies of operation of various hole-type gas multiplication structures (GEM, capillary plates and others) at very high fluxes of x-rays (<60 keV - brehmstrahlung) and pulsed gamma radiation (< 50 MeV - brehmstrahlung). In the case of x-rays the counting rate was 10(5)-10(6) Hz/mm(2) and in the case of gamma it reached up to 10(9) Hz/mm(2) during the pulses. In most of the measurements all detector-area was exposed to these extremely high fluxes. Results obtained so far indicate that the GEM and the hydrogen treated capillary plates could be successfully used in medical imaging applications.