http://hdl.handle.net/20.500.12128/8288
Tytuł: | 57Fe Mossbauer spectroscopy of radiation damaged allanites |
Autor: | Malczewski, Dariusz Grabias, A. |
Słowa kluczowe: | fazy metastabilne; efekt Mössbauera; spektroskopia γ; spektrometria promieniowania gamma; żelazo |
Data wydania: | 2008 |
Źródło: | Acta Physica Polonica A, Vol. 114, nr 6 (2008), s. 1683-1690 |
Abstrakt: | 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. |
URI: | http://hdl.handle.net/20.500.12128/8288 |
ISSN: | 0587-4246 |
Pojawia się w kolekcji: | Artykuły (WNP) |
Plik | Opis | Rozmiar | Format | |
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Malczewski_57Fe_Mossbauer_spectroscopy_of_radiation.pdf | 553,75 kB | Adobe PDF | Przejrzyj / Otwórz |
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