^{57}Fe Mössbauer Spectroscopy οf Radiation Damaged Allanites

• Authors: D. Malczewski , A. Grabias
• Languages of publication: EN

Abstracts

EN

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 α-decays of ^{238}U, ^{232}Th, ^{235}U and their daughter products. We report the results of ^{57}Fe Mössbauer spectroscopy, gamma-ray spectrometry and microprobe analysis of three partially metamict allanites, (Ca,Ce,REE)_2(Fe^{2+},Fe^{3+})(Al,Fe^{3+})_2O[Si_2O_7][SiO_4](OH) where REE stands for rare earth elements. The samples were collected in pegmatites from Reno, Nevada (USA), Franklin, New Jersey (USA) and Nya Bastnas Field (Sweden). The absorbed α-dose for these minerals was found to range from 5.8×10^{14} α-decay/mg for the allanite from Reno to 1.9×10^{15} α-decay/mg for the allanite from Franklin. The Mössbauer spectra show a decrease in the Fe^{2+} doublet intensity with increasing absorbed α-dose. We also observe an increase in the line widths of the Fe^{2+} and Fe^{3+} doublets with increasing absorbed α-dose.

Keywords

EN

33.45.+x; 61.82.Fd; 64.60.My; 76.80.+y

Discipline

• 64.60.My: Metastable phases
• 76.80.+y: Mössbauer effect; other γ-ray spectroscopy(see also 33.45.+x Mössbauer spectra—in atomic and molecular physics; for biophysical applications, see 87.64.kx; for chemical analysis applications, see 82.80.Ej)
• 33.45.+x: Mössbauer spectra(see also 76.80.+y Mössbauer effect; other γ-ray spectroscopy in condensed matter; for biophysical applications, see 87.64.kx; for chemical analysis applications, see 82.80.Ej)

• Journal: Acta Physica Polonica A
• Year: 2008
• Volume: 114
• Issue: 6
• Pages: 1683-1690

Dates

published

2008-12

Contributors

author

D. Malczewski

• Faculty of Earth Sciences, University of Silesia, Będzińska 60, 41-200 Sosnowiec, Poland

author

A. Grabias

• Institute of Electronic Materials Technology, Wólczyńska 133, 01-919 Warszawa, Poland

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Identifiers

DOI

10.12693/APhysPolA.114.1683