Measurements of natural radioactivity and Mössbauer Effect in some soil samples collected from the new campus of Taif University, Saudi Arabia.
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2012
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Eleven soil samples from the new campus of
Taif University and its neighboring areas, Saudi Arabia
have been studied by high-resolution -ray
spectroscopy, x-ray powder diffraction and Mössbauer
spectroscopy to ascertain their overall characterization.
The mean and range of the activity concentrations of
232Th, 234Th, 226Ra, 40K and 137Cs isotopes in the soil
samples are 1.68±0.2 (8.3 - 40.2), 9.83±0.1 (5.6 - 16.5),
12.97±0.2 (7 - 19.1), 625±10 (551 - 739) and 2.79±0.1 (0.7
- 3.9) Bq.kg-1, respectively. The calculated radium
equivalent of soil samples are lower than the limit set in
the OECD report (370 Bq.kg−1). The major Mössbauer
spectral components of soil samples are ferrous and
ferric doublets. This result is consistent with X-ray
powder diffraction results that show the presence of
chlorite, biotite and vermiculite. Small amounts of
hematite were also found in eight samples. The variation
of the obtained Fe2+/Fe3+ ratio is discussed in terms of
the values of the radium equivalent activities to assess, if
any, possible correlation between the specific activity of
samples containing different contents of naturally
occurring radioactivities and their Fe2+/Fe3+ ratios.
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Radioactivity, Mössbauer Spectroscopy, Radium Equivalent
Citação
AHMED, M. A. et. al. Measurements of natural radioactivity and Mössbauer Effect in some soil samples collected from the new campus of Taif University, Saudi Arabia. Journal of Physics, v. 1, p. 31-37, 2012. Disponível em: <http://researchpub.org/journal/jp/number/vol1-no2/vol1-no2-4.pdf>. Acesso em: 20 abr. 2017.