- Tytuł:
- $\text{}^{57}Fe$ Mössbauer Spectroscopy οf Radiation Damaged Allanites
- Autorzy:
-
Malczewski, D.
Grabias, A. - Powiązania:
- https://bibliotekanauki.pl/articles/1811896.pdf
- Data publikacji:
- 2008-12
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Tematy:
-
33.45.+x
61.82.Fd
64.60.My
76.80.+y - Opis:
- 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 $\text{}^{238}U$, $\text{}^{232}Th$, $\text{}^{235}U$ and their daughter products. We report the results of $\text{}^{57}Fe$ 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.
- Źródło:
-
Acta Physica Polonica A; 2008, 114, 6; 1683-1690
0587-4246
1898-794X - Pojawia się w:
- Acta Physica Polonica A
- Dostawca treści:
- Biblioteka Nauki
Artykuł