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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 40K. Thick solid line average 40K activity in typical carbonates; thin solid line average 40K activity using all the samples; thin dotted line = average activity of 40K using only samples 2, 3, 4, and 5
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Fig4: Activity concentrations of 40K. Thick solid line average 40K activity in typical carbonates; thin solid line average 40K activity using all the samples; thin dotted line = average activity of 40K using only samples 2, 3, 4, and 5

Mentions: The highest 40K activity concentrations occurred in sample 6 (quartzite) at 572 Bqkg−1, and sample 1 (calcschist) at 392 Bqkg−1 (Table 2, Fig. 4). The lowest activities occurred in samples 3 (limestone dolomite) and 5 (marble), at 18 and 78 Bqkg−1, respectively. Intermediate values were observed in sample 2 (carbonaceous breccia) at 111 Bqkg−1, and in sample 5 (dolomite) at 129 Bqkg−1. As shown in Fig. 4, an average value of 40K activity over all samples is 217 Bqkg−1. This value is relatively high compared to the average in typical carbonate rocks, 70 Bqkg−1. The higher value results from increased activity concentrations of potassium-40 in calcschist and quartzite. However, the average activity calculated only from samples 2, 3, 4, and 5 (“pure carbonates”), 84 Bqkg−1, is close to that observed in typical carbonate rocks (Fig. 4). It should be emphasized that the 40K activity concentrations in the samples, with the exception of quartzite, are below the average activity of 40K observed in typical soils, ca 400 Bqkg−1 [17, 18].Fig. 4


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

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

Activity concentrations of 40K. Thick solid line average 40K activity in typical carbonates; thin solid line average 40K activity using all the samples; thin dotted line = average activity of 40K using only samples 2, 3, 4, and 5
© Copyright Policy
Related In: Results  -  Collection

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Fig4: Activity concentrations of 40K. Thick solid line average 40K activity in typical carbonates; thin solid line average 40K activity using all the samples; thin dotted line = average activity of 40K using only samples 2, 3, 4, and 5
Mentions: The highest 40K activity concentrations occurred in sample 6 (quartzite) at 572 Bqkg−1, and sample 1 (calcschist) at 392 Bqkg−1 (Table 2, Fig. 4). The lowest activities occurred in samples 3 (limestone dolomite) and 5 (marble), at 18 and 78 Bqkg−1, respectively. Intermediate values were observed in sample 2 (carbonaceous breccia) at 111 Bqkg−1, and in sample 5 (dolomite) at 129 Bqkg−1. As shown in Fig. 4, an average value of 40K activity over all samples is 217 Bqkg−1. This value is relatively high compared to the average in typical carbonate rocks, 70 Bqkg−1. The higher value results from increased activity concentrations of potassium-40 in calcschist and quartzite. However, the average activity calculated only from samples 2, 3, 4, and 5 (“pure carbonates”), 84 Bqkg−1, is close to that observed in typical carbonate rocks (Fig. 4). It should be emphasized that the 40K activity concentrations in the samples, with the exception of quartzite, are below the average activity of 40K observed in typical soils, ca 400 Bqkg−1 [17, 18].Fig. 4

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