Mathematical Modeling of Radon Emanation

Sasaki, Tomozo; Gunji, Yasuyoshi; Okuda, Takeshi

doi:10.1080/18811248.2004.9715470

Cited by 49 publications

(10 citation statements)

References 2 publications

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“…The environmental conditions of the direct measurements with proportional counters differed from the standard operation conditions, as the detector and gas system were at different temperatures and exposed to nitrogen or helium, respectively. Both the increased temper- ature and reduced stopping power are known to impact the emanation rate of 222 Rn (for example, see [25,26]) and we consider the direct measurement to be a weak confirmation of our results.…”

Section: Resultsmentioning

confidence: 52%

Intrinsic backgrounds from Rn and Kr in the XENON100 experiment

Aprile¹,

Aalbers²,

Agostini³

et al. 2018

Eur. Phys. J. C

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In this paper, we describe the XENON100 data analyses used to assess the target-intrinsic background sources radon ( 222 Rn), thoron ( 220 Rn) and krypton ( 85 Kr). We detail the event selections of high-energy alpha particles and decay-specific delayed coincidences. We derive distributions of the individual radionuclides inside the detector and quantify their abundances during the main three science runs of the experiment over a period of ∼ 4 years, from January 2010 to January 2014. We compare our results to external measurements of radon emanation and krypton concentrations where we find good agreement. We report an observed reduction in concentrations of radon daughters that we attribute to the plating-out of charged ions on the negatively biased cathode.

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Section: Resultsmentioning

confidence: 52%

Intrinsic backgrounds from Rn and Kr in the XENON100 experiment

Aprile¹,

Aalbers²,

Agostini³

et al. 2018

Eur. Phys. J. C

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“…A fraction of the generated radon enters the pore space; this is called the emanation fraction, f , with a representative range of 0.1-0.4 (Markkanen and Arvela, 1992). The emanation fraction for a dry soil is a factor of 2-3 lower than for soil at around 10% of saturation (Zhuo et al, 2006) because soil grains in moist soil are enveloped by a water film which decelerates recoiling nuclei that would otherwise travel across the pore space to become embedded in adjacent soil grains (Sasaki et al, 2004;Sakoda et al, 2010). Increasing soil moisture beyond 10% has little further impact on f .…”

Section: Diffusion Modelmentioning

confidence: 99%

A map of radon flux at the Australian land surface

et al. 2010

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Abstract.A time-dependent map of radon-222 flux density at the Australian land surface has been constructed with a spatial resolution of 0.05 • and temporal resolution of one month. Radon flux density was calculated from a simple model utilising data from national gamma-ray aerial surveys; modelled soil moisture, available from 1900 in near realtime; and maps of soil properties. The model was calibrated against a data set of accumulation chamber measurements, thereby constraining it with experimental data. A notable application of the map is in atmospheric mixing and transport studies which use radon as a tracer, where it is a clear improvement on the common assumption of uniform radon flux density.

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“…This is not unexpected since, up to a point, radon emanation increases with the moisture content of materials (Strong and Levins 1982) due to the presence of bulk water between sample grains (Sasaki et al 2004), and the Ba(Ra)SO 4 residues presumably contain little water. This is not unexpected since, up to a point, radon emanation increases with the moisture content of materials (Strong and Levins 1982) due to the presence of bulk water between sample grains (Sasaki et al 2004), and the Ba(Ra)SO 4 residues presumably contain little water.…”

Section: Discussionmentioning

confidence: 83%

AN EXPERIMENTAL ANALYSIS OF THE CONTRIBUTION OF 224Ra AND 226Ra AND PROGENY TO THE GROSS ALPHA-PARTICLE ACTIVITY OF WATER SAMPLES

Arndt

West

2008

Health Physics

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The gross alpha-particle activity of water samples analyzed by EPA Method 900.0 is investigated as a function of residue mass and geometry, time between sample collection and analysis, and time between sample preparation and analysis for samples containing 224Ra, 212Pb, and 226Ra. It is shown that the gross alpha-particle activity due to 224Ra and its progeny can be up to 10 times the 224Ra activity at collection time and that due to 212Pb progeny can be up to 3 times the 212Pb activity at collection time. In samples with roughly equal activities of 224Ra and 226Ra analyzed soon after collection, it is shown that the gross alpha-particle activity is approximately constant with time because the decay of 224Ra and its progeny is offset by the ingrowth of 226Ra progeny.

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Mathematical Modeling of Radon Emanation

Cited by 49 publications

References 2 publications

Intrinsic backgrounds from Rn and Kr in the XENON100 experiment

Intrinsic backgrounds from Rn and Kr in the XENON100 experiment

A map of radon flux at the Australian land surface

AN EXPERIMENTAL ANALYSIS OF THE CONTRIBUTION OF 224Ra AND 226Ra AND PROGENY TO THE GROSS ALPHA-PARTICLE ACTIVITY OF WATER SAMPLES

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