IEEE TRANSACTIONS ON NUCLEAR SCIENCE, vol.50, no.4, pp.809-819, 2003 (SCI-Expanded)
We performed studies in the operation of various hole-type gaseous multiplication structures (GEM, capillary plates, and others) at very high fluxes of X-rays (<60 keV-bremsstrahlung) and pulsed gamma radiation (<50 MeV-bremsstrahlung). In the case of X-rays, the counting rate was 10(5)-10(6) Hz/mm(2); in the case of gammas it reached levels of up to 10(9) Hz/mm(2) during the pulses. In most measurements, the entire area of the detector 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.