Post-effects of radioactive decay in magnetite nano-crystals labelled with Auger- and internal conversion electron-emitters, alpha- and beta decay radionuclides

摘要: Abstract By applying the standard technique of co-precipitation ferric- and ferrous salts with ammonium hydroxide in an inert atmosphere, magnetite nano-crystallites have been prepared labelled Auger- internal conversion electrons, beta- alpha-emitters (57Co, 60Co 241Am radionuclides). It has confirmed by methods both X-ray phase analysis Absorption Mossbauer Spectroscopy that for cases (the “pure” crystallite ones doped radionuclides), it is nanoparticles a spherical shape were synthesized structure crystallites diameter 12–18 nm; there no admixtures other iron compounds detected. shown governing stabilization factor daughter atoms produced 57Co(II) as result electron capture (EC) size atom whose position originally occupied parent atom: emission spectra are only Fe2+-species “present”. A comparative conducted radiation-induced damage patterns dependence nuclear- physical characteristics radioactive tracer total fluence. established under irradiation comminution taking place, effective magnetic fields on remaining unchanged irrespective “dose load”. Resulting from decay 241Am, nucleus receives energy 92.3 keV, range 237Np nuclei (while account taken entire cascade possible collisions) amounting to almost 40 nm, which twice “nano-containers” escape volume experimentally method 2πα-counting).