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| Titel |
Heterogeneous temperature sensitivity of effective radium concentration from various rock and soil samples |
| VerfasserIn |
F. Girault, F. Perrier |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 11, no. 6 ; Nr. 11, no. 6 (2011-06-06), S.1619-1626 |
| Datensatznummer |
250009483
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| Publikation (Nr.) |
 copernicus.org/nhess-11-1619-2011.pdf |
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| Zusammenfassung |
| Temporal variations of radon concentration, or spatial variations around
geothermal systems, are partly driven by the effect of temperature on the
radon source term, the effective radium concentration (ECRa). ECRa
from 12 crushed rock and 12 soil samples from Nepal was measured in the
laboratory using the radon accumulation method and Lucas scintillation
flasks at three temperatures: 7, 22 and 37 °C. For each sample and at
each temperature, 5 or 6 measurements were carried out, representing a total
of 360 measurements, with an ECRa average varying from 1.1 to 75 Bq kg−1. While the effect is small, ECRa was observed to increase
with temperature in a significant and sufficiently reproducible manner. The
increase was approximately linear with a slope (temperature sensitivity,
TS) expressed in % °C−1. We observed a large heterogeneity of
TS with average values (range min-max) of 0.79 ± 0.05 (0.16–2.0) %
°C−1 and 0.61 ± 0.05 (0.10–2.0) % °C−1, for rock and
soil samples, respectively. While this range overlaps with the results of
previous studies, our values of TS tend to be smaller. The observed
heterogeneity implies that the TS, rather poorly understood, needs to be
assessed by dedicated experiments in every case where it is of consequence
for the interpretation. |
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