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Natural radioactivity in rocks of the Modane-Aussois region (SE France).

Malczewski D, Żaba J - J Radioanal Nucl Chem (2011)

Bottom Line: The activity concentrations of (40)K varied from 18 Bqkg(-1) (limestone dolomite) to 392 Bqkg(-1) (calcschist), while those of (232)Th varied from 0.7 Bqkg(-1) (limestone dolomite) to 18 Bqkg(-1) (calcschist).The activities associated with (238)U ranged from 9 (quartzite) to 29 Bqkg(-1) (dolomite).In the investigated rock samples, concentrations of (238)U (ppm) and (40)K (%) had a strong negative correlation.

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Affiliation: Faculty of Earth Sciences, University of Silesia, Będzińska 60, 41-200 Sosnowiec, Poland.

ABSTRACT

The activity concentrations of (40)K, (232)Th, and (238)U in the characteristic rocks of the Modane-Aussois region (Western Alps, France) were determined using an HPGe gamma-ray spectrometry system. The activity concentrations of (40)K varied from 18 Bqkg(-1) (limestone dolomite) to 392 Bqkg(-1) (calcschist), while those of (232)Th varied from 0.7 Bqkg(-1) (limestone dolomite) to 18 Bqkg(-1) (calcschist). The activities associated with (238)U ranged from 9 (quartzite) to 29 Bqkg(-1) (dolomite). In the investigated rock samples, concentrations of (238)U (ppm) and (40)K (%) had a strong negative correlation.

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Activity concentrations of 232Th. Thick solid line average 232Th activity in typical carbonates; thin solid line average 232Th activity using all the samples; thin dotted line average activity of 232Th using only samples 2, 3, 4, and 5
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Fig5: Activity concentrations of 232Th. Thick solid line average 232Th activity in typical carbonates; thin solid line average 232Th activity using all the samples; thin dotted line average activity of 232Th using only samples 2, 3, 4, and 5

Mentions: As seen in Table 2, radioactive equilibrium is achieved for each sample between progenies in the 232Th series. Since 228Ac is the second radionuclide in the thorium series, the activity concentration of 232Th can be assumed to be equal to the 228Ac activity. As seen in Fig. 5, the measured activities associated with the 232Th series were the highest in calcschist (18 Bqkg−1) and quartzite (10.4 Bqkg−1). By far, the lowest 232Th activity below 1 Bqkg−1 was observed in sample 3 (limestone dolomite). Intermediate values of 2.4, 3.8, and 5.5 Bqkg−1 were found in samples 5, 4, and 2, respectively (Table 2). The 232Th activity averaged over all the samples is 7 Bqkg−1 (Fig. 5). Considering activities from the “pure carbonates” (samples 2, 3, 4, and 5), the resulting average value of 3 Bqkg−1 is nearly three times lower than the average reported for carbonates, 8 Bqkg−1 [17]. Similar to the results for 40K, the average activity of 232Th in the investigated rocks is clearly below the averages of 232Th observed in a typical soil (37 Bqkg−1) and in the continental crust (44 Bqkg−1).Fig. 5


Natural radioactivity in rocks of the Modane-Aussois region (SE France).

Malczewski D, Żaba J - J Radioanal Nucl Chem (2011)

Activity concentrations of 232Th. Thick solid line average 232Th activity in typical carbonates; thin solid line average 232Th activity using all the samples; thin dotted line average activity of 232Th using only samples 2, 3, 4, and 5
© Copyright Policy
Related In: Results  -  Collection

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Fig5: Activity concentrations of 232Th. Thick solid line average 232Th activity in typical carbonates; thin solid line average 232Th activity using all the samples; thin dotted line average activity of 232Th using only samples 2, 3, 4, and 5
Mentions: As seen in Table 2, radioactive equilibrium is achieved for each sample between progenies in the 232Th series. Since 228Ac is the second radionuclide in the thorium series, the activity concentration of 232Th can be assumed to be equal to the 228Ac activity. As seen in Fig. 5, the measured activities associated with the 232Th series were the highest in calcschist (18 Bqkg−1) and quartzite (10.4 Bqkg−1). By far, the lowest 232Th activity below 1 Bqkg−1 was observed in sample 3 (limestone dolomite). Intermediate values of 2.4, 3.8, and 5.5 Bqkg−1 were found in samples 5, 4, and 2, respectively (Table 2). The 232Th activity averaged over all the samples is 7 Bqkg−1 (Fig. 5). Considering activities from the “pure carbonates” (samples 2, 3, 4, and 5), the resulting average value of 3 Bqkg−1 is nearly three times lower than the average reported for carbonates, 8 Bqkg−1 [17]. Similar to the results for 40K, the average activity of 232Th in the investigated rocks is clearly below the averages of 232Th observed in a typical soil (37 Bqkg−1) and in the continental crust (44 Bqkg−1).Fig. 5

Bottom Line: The activity concentrations of (40)K varied from 18 Bqkg(-1) (limestone dolomite) to 392 Bqkg(-1) (calcschist), while those of (232)Th varied from 0.7 Bqkg(-1) (limestone dolomite) to 18 Bqkg(-1) (calcschist).The activities associated with (238)U ranged from 9 (quartzite) to 29 Bqkg(-1) (dolomite).In the investigated rock samples, concentrations of (238)U (ppm) and (40)K (%) had a strong negative correlation.

View Article: PubMed Central - PubMed

Affiliation: Faculty of Earth Sciences, University of Silesia, Będzińska 60, 41-200 Sosnowiec, Poland.

ABSTRACT

The activity concentrations of (40)K, (232)Th, and (238)U in the characteristic rocks of the Modane-Aussois region (Western Alps, France) were determined using an HPGe gamma-ray spectrometry system. The activity concentrations of (40)K varied from 18 Bqkg(-1) (limestone dolomite) to 392 Bqkg(-1) (calcschist), while those of (232)Th varied from 0.7 Bqkg(-1) (limestone dolomite) to 18 Bqkg(-1) (calcschist). The activities associated with (238)U ranged from 9 (quartzite) to 29 Bqkg(-1) (dolomite). In the investigated rock samples, concentrations of (238)U (ppm) and (40)K (%) had a strong negative correlation.

No MeSH data available.


Related in: MedlinePlus