Abstract
For this work, a parallel plate avalanche counter was used, filled with ketone gas within the ionization chamber, to obtain CEM spectra for non-conducting samples: α-Fe2O3, Fe3O4, Fe(NH4)2(SO4)2·6H2O, and a mineral sample (clay). The samples were prepared by three alternative methods. The Mössbauer parameters for CEM and transmission spectra were compared.