Spatial and time variations of radon-222 concentration in the atmosphere of a dead-end horizontal tunnel

Richon, Patrick; Perrier, Frédéric; Sabroux, J. C.; Trique, Michaeel; Ferry, Cécile; Voisin, Vincent; Pili, Éric

doi:10.1016/j.jenvrad.2004.05.001

Cited by 69 publications

(58 citation statements)

References 40 publications

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“…Several radon dose calculation methods related to human health have been reported in the literature (Denman and Parkinson 1996;Qureshi et al 2000;Furuta et al 2002;Lario et al 2005). The annual effective dose of 222 Rn received in a cave in this study was calculated using the formula (Richon et al 2005):…”

Section: Dose Calculation and Risk Estimationmentioning

confidence: 99%

“…A working level month (WLM) is the exposure to the radon short-lived decay products in equilibrium with a concentration of 3,700Bq m −3 (100 × 10 −12 Ci l −1 ) of 222 Rn during a working month (170h) (Richon et al 2005). 1,100, 1,110 and 1,150Bq m −3 .…”

Section: Dose Calculation and Risk Estimationmentioning

confidence: 99%

“…Radon is second only to smoking as a cause of lung cancer (Copes and Scott 2007), and it is recognized as a group I carcinogen by the International Agency for Research on Cancer (International Agency for Research on Cancer 2007). Understanding the properties of 222 Rn and its decay products in the ambient environment is of great importance due to the effects of radon on human health, especially in workplaces where the 222 Rn concentration exceeds the radon action level (Dueñas et al 1999(Dueñas et al , 2005Sperrin et al 2000;Gillmore et al 2001Gillmore et al , 2002Przylibski 2001;Richon et al 2005).…”

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confidence: 99%

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An Environmental Risk Assessment of Radon in Lantian Karst Cave of Shaanxi, China

Zhang

2008

Water Air Soil Pollut

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The radiation dose and environmental health risk of radon concentration in the Lantian karst cave of China to guides and visitors were estimated based on the continuous radon concentration monitoring. Distinct seasonal variations were observed in the radon concentration of the air inside the cave. The maximum concentration occurred in the summer, whereas the minimum radon concentration occurred during the winter. The annual average radon concentration in the caves investigated is slightly higher than the upper bound of radon action level for underground space used in China and less than the upper bound of radon action level recommended by the International Commission on Radiation Protection (ICRP) for workplaces. The annual effective dose to tour guides working in two investigated caves varies from 4.1 to 16.5mSv, depending on different equilibrium factors together with different dose conversion factors proposed in the literature. The annual maximum time that a tour guide or other worker can safely be inside the cave is estimated to be 1,250 or 2,246h, depending on whether one bases this on the high or mean radon concentration, with an equilibrium factor of one in both cases. Given the synergistic effects of smoking, tour guides who are smokers should be in the cave only 10-20% of these hours. In all cases, the annual effective doses to visitors are well below the 1mSv maximum suggested dose for a member of the public for 1 year.

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Section: Dose Calculation and Risk Estimationmentioning

confidence: 99%

Section: Dose Calculation and Risk Estimationmentioning

confidence: 99%

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confidence: 99%

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An Environmental Risk Assessment of Radon in Lantian Karst Cave of Shaanxi, China

Zhang

2008

Water Air Soil Pollut

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“…[59][60][61][62]), a number of studies both in experimental and field settings concluded that atmospheric pressure does not influence radon variability (e.g. [63][64][65][66][67]). …”

Section: Challenges and Perspectivesmentioning

confidence: 99%

Radon applications in geosciences – Progress & perspectives

Barbosa

Donner

Steinitz

2015

Eur. Phys. J. Spec. Top.

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Abstract. During the last decades, the radioactive noble gas radon has found a variety of geoscientific applications, ranging from its utilization as a potential earthquake precursor and proxy of tectonic stress over its specific role in volcanic environments to a wide range of applications as a tracer in marine and hydrological settings. This topical issue summarizes the current state of research as exemplified by some original research articles covering the aforementioned as well as other closely related aspects and points to some important future directions of radon application in geosciences. This editorial provides a more detailed overview of the contents of this volume, a brief summary of the rationale underlying the diverse applications, and outlines some important perspectives.

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“…A characteristic exponential decay results from the natural ventilation of the tunnel [26,27]. These transient CO 2 perturbations by human breathing can be used to quantify the natural ventilation in the tunnel.…”

Section: Dealing With the Strong Concentration Dependence Of The Isotmentioning

confidence: 99%

Monitoring CO2 concentration and δ13C in an underground cavity using a commercial isotope ratio infrared spectrometer

2015

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International audienceCO2 stable carbon isotopes are very attractive in environmental research to investigate both natural and anthropogenic carbon sources. Laser-based isotope ratio infrared spectrometers (IRIS) allow in situ continuous monitoring of CO2 isotopes, and therefore they have a potential for unprecedented understanding of carbon sources and dynamics with a high temporal resolution. Here we present the performance assessment of a commercial IRIS analyzer, including the measurement setup and the data processing scheme that we used. Even if the analyzer performs 1-Hz measurements, an integration time of the order of 1 h is commonly needed to obtain acceptable precision for δ13C. The main sources of uncertainty on δ13C come from the concentration dependence and from the temporal instability of the analyzer. The method is applied to the in situ monitoring of the CO2 carbon isotopes in an underground cavity (Roselend Natural Laboratory, France) during several months. On a weekly timescale, the temporal variability of CO2 is dominated by transient contamination by human breath. Discarding these anthropogenic contaminations, CO2 and δ13C backgrounds do not show diurnal or seasonal fluctuations. A CO2 flux released into the tunnel by the surrounding rocks is measured. The carbon isotope composition of this CO2, identified with a Keeling plot, is consistent with a main production by microbial respiration and a minor production from weathering of carbonate minerals. The presented instrument and application study are relevant to cave monitoring, whether to understand CO2 dynamics in visited and/or painted caves for preservation purposes or to understand paleoclimate recording in speleothems

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Spatial and time variations of radon-222 concentration in the atmosphere of a dead-end horizontal tunnel

Cited by 69 publications

References 40 publications

An Environmental Risk Assessment of Radon in Lantian Karst Cave of Shaanxi, China

An Environmental Risk Assessment of Radon in Lantian Karst Cave of Shaanxi, China

Radon applications in geosciences – Progress & perspectives

Monitoring CO2 concentration and δ13C in an underground cavity using a commercial isotope ratio infrared spectrometer

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