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Title: 57Fe Mossbauer spectroscopy of radiation damaged allanites
Authors: Malczewski, Dariusz
Grabias, A.
Keywords: fazy metastabilne; efekt Mössbauera; spektroskopia γ; spektrometria promieniowania gamma; żelazo
Issue Date: 2008
Citation: Acta Physica Polonica A, Vol. 114, nr 6 (2008), s. 1683-1690
Abstract: Metamict minerals contain radioactive elements that degrade the crystal structure of the minerals. The degradation occurs primarily through progressive overlapping recoil nuclei collision cascades from ®-decays of 238U, 232Th, 235U and their daughter products. We report the results of 57Fe Mossbauer spectroscopy, gamma-ray spectrometry and microprobe analysis of three partially metamict allanites, (Ca,Ce,REE)2(Fe2+; Fe3+)(Al; Fe3+)2O[Si2O7][SiO4](OH) where REE stands for rare earth elements. The samples were collected in pegmatites from Reno, Nevada (USA), Franklin, New Jersey (USA) and Nya Bast- nas Field (Sweden). The absorbed ®-dose for these minerals was found to range from 5:8 £ 1014 ®-decay/mg for the allanite from Reno to 1:9 £ 1015 ®-decay/mg for the allanite from Franklin. The Mossbauer spectra show a decrease in the Fe2+ doublet intensity with increasing absorber ®-dose. We also observe an increase in the line widths of the Fe2+ and Fe3+ doublets with increasing absorbed ®-dose.
ISSN: 0587-4246
Appears in Collections:Artykuły (WNP)

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