Mössbauer Spectrometry Study of Biological Tissues
I. Bonkováa, M. Miglierini b, M. Bujdoš a and M. Kopáni c
aComenius University in Bratislava, Faculty of Natural Sciences, Institute of Laboratory Research on Geomaterials, Ilkovičova 6, 842 15 Bratislava, Slovakia
bSlovak University of Technology in Bratislava, Faculty of Electrical Engineering and Information Technology, Institute of Nuclear and Physical Engineering, Ilkovičova 3, 812 19 Bratislava, Slovakia
cComenius University in Bratislava, Faculty of Medicine, Department of Medical Physics, Biophysics, Informatics and Telemedicine, Sasinkova 4, 811 08 Bratislava, Slovakia
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Magnetic microstructure of iron contained in selected biological tissues is characterized and mutually compared. We have studied three types of biological samples prepared from human brain, human and horse spleen. Original samples were lyophilized (dried in a vacuum) thus providing powder forms. As a principal method of study, 57Fe Mössbauer spectrometry in transmission mode was used. The Mössbauer spectrometry experiments were performed at room ( ≈300 K) and at liquid helium (4.2 K) temperature. At room temperature Mössbauer spectra show doublet-like features. Such behaviour indicates possible presence of nanoparticles with fluctuating magnetic moments that acquire arbitrary positions. On the other hand, low temperature Mössbauer spectrometry measurements demonstrate significant contribution of sextets that confirmed occurrence of blocked magnetic moments of iron-containing particles. Different relative contributions of magnetic components in the low temperature spectra for the three inspected biological tissues suggest differences in the blocking temperatures of the magnetic nanoparticles present in them.

DOI: 10.12693/APhysPolA.131.1081
PACS numbers: 33.45.+x, 87.64.kx, 31.30.Gs, 87.15.B-, 75.75.-c