Mössbauer effect reference absorbers contain chemical substances synthesized with either enriched 57Fe (> 95 %) or natural iron. The substances are uniformly dispersed in polyethylene and shaped into discs: 20 mm in diameter, placed between two polyimide films with total thickness of 100 ± 10 μm in aluminium holders. Potassium and potassium-magnesium ferrocyanide [K4Fe(CN)6×3H2O; K2MgFe(CN)6] exhibit unsplit narrow line in Mössbauer absorption spectra. Ferrous oxalate dihydrate [FeC2O4×2H2O] exhibits quadrupole splitting, leading to two narrow lines in Mössbauer absorption spectrum. Metallic iron and iron oxide [αFe; Fe2O3] exhibit magnetic hyperfine splitting, leading to six narrow lines in Mössbauer absorption spectra.
|Description||Thickness, mg 57Fe/cm2||Code|
|Enriched iron reference absorbers|
|α–Fe foil||3 μm||MRA.1.6|
|Natural iron reference absorbers|
|α–Fe foil||30 μm||MRA.2.6|
* — “X” is the thickness of the reference absorber in mg (57Fe/cm2):