scholarly journals Influence of the accumulation chamber insertion depth to measure surface radon exhalation rates

2020 ◽  
Vol 393 ◽  
pp. 122344
Author(s):  
I. Gutiérrez-Álvarez ◽  
J.L. Guerrero ◽  
J.E. Martín ◽  
J.A. Adame ◽  
J.P. Bolívar
Keyword(s):  
Insertion Depth ◽  
Radon Exhalation ◽  
Accumulation Chamber ◽  
Radon Exhalation Rates

Influence of the accumulation chamber insertion depth to measure surface radon exhalation rates

2021 ◽  
Author(s):  
Isidoro Gutiérrez Álvarez ◽  
José Luis Guerrero ◽  
José Enrique Martín ◽  
José Antonio Adame ◽  
Juan Pedro Bolívar
Keyword(s):  
Field Experiments ◽  
Lateral Diffusion ◽  
External Effects ◽  
Insertion Depth ◽  
Radon Exhalation ◽  
Accumulation Chamber ◽  
Diffusion Effects ◽  
Radon Exhalation Rates ◽  
The City ◽  
Effective Decay

<p>A common method to measure radon exhalation rates relies on the accumulation chamber technique. Usually, this approach only considers one-dimensional gas transport within the soil that neglects lateral diffusion. However, this lateral transport could reduce the reliability of the method. In this work, several cylindrical- shaped accumulation chambers were built with different heights to test if the insertion depth of the chamber into the soil improves the reliability of the method and, in that case, if it could limit the radon lateral diffusion effects. To check this hypothesis in laboratory, two reference exhalation boxes were manufactured using phospho- gypsum from a repository located nearby the city of Huelva, in the southwest of Spain. Laboratory experiments showed that insertion depth had a deep impact in reducing the effective decay constant of the system, extending the interval where the linear fitting can be applied, and consistently obtaining reliable exhalation measurements once a minimum insertion depth is employed. Field experiments carried out in the phosphogypsum repository showed that increasing the insertion depth could reduce the influence of external effects, increasing the re- peatability of the method. These experiments provided a method to obtain consistent radon exhalation mea- surements over the phosphogypsum repository.</p>

scholarly journals Long-Term Measurements of Radon and Thoron Exhalation Rates from the Ground Using the Vertical Distributions of Their Activity Concentrations

2021 ◽  
Vol 18 (4) ◽  
pp. 1489
Author(s):  
Oumar Bobbo Modibo ◽  
Yuki Tamakuma ◽  
Takahito Suzuki ◽  
Ryohei Yamada ◽  
Weihai Zhuo ◽  
...  
Keyword(s):  
Seasonal Variation ◽  
Long Term Results ◽  
Exhalation Rate ◽  
Radon Exhalation ◽  
Accumulation Chamber ◽  
Activity Concentrations ◽  
Vertical Distributions ◽  
Radon Exhalation Rates ◽  
Good Agreement

A long-term measurement technique of radon exhalation rate was previously developed using a passive type radon and thoron discriminative monitor and a ventilated type accumulation chamber. In the present study, this technique was applied to evaluate the thoron exhalation rate as well, and long-term measurements of radon and thoron exhalation rates were conducted for four years in Gifu Prefecture. The ventilated type accumulation chamber (0.8 × 0.8 × 1.0 m3) with an open bottom was embedded 15 cm into the ground. The vertical distributions of radon and thoron activity concentrations from the ground were obtained using passive type radon-thoron discriminative monitors (RADUETs). The RADUETs were placed at 1, 3, 10, 30, and 80 cm above the ground inside the accumulation chamber. The measurements were conducted from autumn 2014 to autumn 2018. These long-term results were found to be in good agreement with the values obtained by another methodology. The radon exhalation rates from the ground showed a clearly seasonal variation. Similar to findings of previous studies, radon exhalation rates from summer to autumn were relatively higher than those from winter to spring. In contrast, thoron exhalation rates were not found to show seasonal variation.

The Determination of Radon Exhalation Rates

1983 ◽  
Vol 45 (2) ◽  
pp. 369-376 ◽  
Author(s):  
Niels Jonassen
Keyword(s):  
Radon Exhalation ◽  
Radon Exhalation Rates

scholarly journals Radon exhalation rates from zircon sands and ceramic tiles in Italy

2009 ◽  
Vol 44 (5) ◽  
pp. 445-451 ◽  
Author(s):  
S. Verità ◽  
S. Righi ◽  
R. Guerra ◽  
M. Jeyapandian
Keyword(s):  
Ceramic Tiles ◽  
Radon Exhalation ◽  
Radon Exhalation Rates

Fractal Analysis of Spatial Distribution of Radon Exhalation Rates of Uranium Mill Tailings

2012 ◽  
Vol 524-527 ◽  
pp. 584-587
Author(s):  
Yan Shi Xie ◽  
Kai Xuan Tan ◽  
Liang Chen ◽  
Kai Guang Hu ◽  
Zheng Qing Wang ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Fractal Structure ◽  
Pore Connectivity ◽  
Fractal Method ◽  
Radon Exhalation ◽  
Two Dimension ◽  
Radium Content ◽  
Mill Tailings ◽  
Radon Exhalation Rates ◽  
Uranium Mill Tailings

A uranium mill tailings, located in Guangdong, was selected for spatial distribution of the radon exhalation rates measured by local static method. The two-dimension surface of radon exhalation rates was established by Surfer using the data of spatial distribution of radon exhalation rates measured at August 14, 2007 to 19 and 21, which was analyzed by fractal method of projective covering. The results show that the two-dimension surface of radon exhalation rates is of fractal structure. The fractal dimension of surface of radon exhalation rates from August 14, 2007 to 19 and 21 are 2.0535, 2.0173, 2.0029, 2.0084, 2.0079, 2.0057 and 2.0034, respectively, which indicates that the complexity of spatial distribution of the radon exhalation rates at 14 and 15 are larger than that of the other days. The phenomenon results from the change of precipitation and temperature, as well as the features of uranium mill tailings, including mineral composition, particle size, radium content, porosity and pore connectivity, etc.

Radioactivity and radon exhalation rates of building materials in The Netherlands

1985 ◽  
Vol 45 ◽  
pp. 151-156 ◽  
Author(s):  
J.G. Ackers ◽  
J.F. Den Boer ◽  
P. De Jong ◽  
R.A. Wolschrijn
Keyword(s):  
The Netherlands ◽  
Building Materials ◽  
Radon Exhalation ◽  
Radon Exhalation Rates
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