Measurement of the radon exhalation rate from the medium surface by tracing the radon concentration

Tan, Yanliang; Xiao, Detao

doi:10.1007/s10967-012-2294-9

Cited by 8 publications

(6 citation statements)

References 15 publications

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“…If this condition is not satised, we can add radon adsorption equipment at the route of the outdoor air into the ventilation-type accumulation chamber. When the value of C E is neglectable, eqn (17) can be rewritten as…”

Section: Discussionmentioning

confidence: 99%

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A novel method to measure the radon exhalation rate in only one measurement cycle

Tan

Xiao

2013

Anal. Methods

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A novel method was proposed to measure the radon exhalation rate in only one measurement cycle. We obtain the radon concentration variety regulation in the internal cell of the RAD7 by analyzing the work principle of RAD7 and the radon concentration variety regulation in the ventilation-type accumulation chamber when the effects of leakage and back diffusion are neglected. This method uses the measured value before the radon concentration in the ventilation-type accumulation chamber reaches a steady state. Several radon exhalation rate measurements of the medium surface have been performed in the Radon Laboratory of the University of South China. The radon exhalation rates obtained by verification experiments are in good agreement with the reference value. This simple, accurate and fast method can be applied to develop and improve the instruments for measuring radon exhalation rates.

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Section: Discussionmentioning

confidence: 99%

“…When RAD7 is used to measure radon concentration in the sniff mode, the number of a particles emitted by 218 Po is used to express the radon concentration. 9,16,17 The progeny of radon is ltered, when the radon is sniffed into RAD7. The 218 Po concentration in the internal cell of RAD7 is:…”

Section: Methodsmentioning

confidence: 99%

A novel method to measure the radon exhalation rate in only one measurement cycle

Tan

Xiao

2013

Anal. Methods

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“…Then, this measurement was conducted on 3 different days that the letter is intended to after number. In conducting short-term continuous sampling, time intervals that have been used by other researchers were 10, 12, 15, 20, 40, 60-minute or 2 hours [4,5,7,[11][12][13][14]. 2) In this study, radon data were collected with 5 and 15-minute periods during total measurement time of 4 hours.…”

Section: Soil Exhalation Rate Measurementmentioning

confidence: 99%

“…Among all the natural/artificial sources the inhalation of radon gases contributes the most, 1.26 mSv which is about 42% of the total annual dose 3.0 mSv as shown in Figure 1. The main source of radon is mostly the soil and underlying geology [4]. Soil radon contributes about 69% of all radon sources [1].…”

Section: Introductionmentioning

confidence: 99%

“…Soil radon contributes about 69% of all radon sources [1]. From the soil, radon is mainly transported by air pressure differences to the indoor occupied space [4]. For outdoor, radon levels are mainly determined by the soil characteristics, such as the content of uranium and radium, porosity, and the consequent radon exhalation rate; local topology; and the conditions of meteorology [5].…”

Section: Introductionmentioning

confidence: 99%

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Standard Measurement Procedure for Soil Radon Exhalation Rate and Its Uncertainty

et al. 2018

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Background: Radon contributing about 42% of annual average dose, mainly comes from soil. In this paper, standard measurement procedures for soil radon exhalation rate are suggested and their measurement uncertainties are analyzed. Materials and Methods: We used accumulation method for estimating surface exhalation rate. The closed-loop measurement system was made up with a RAD7 detector and a surface chamber. Radon activity concentrations in the system were observed as a function of time, with data collection of 5 and 15-minute and the measurement time of 4 hours. Linear and exponential fittings were used to obtain radon exhalation rates from observed data. Standard deviations of measurement uncertainties for two approaches were estimated using usual propagation rules. Results and Discussion: The exhalation rates (E) from linear approach, with 30 minutes measurement time were 44.8-48.6 mBq• m-2 • s-1 or 2.14-2.32 atom• cm-2 • s-1 with relative measurement uncertainty of about 10%. The contributions of fitting parameter A, volume (V) and surface (S) to the estimated measurement uncertainty of E were 59.8%, 30.1% and 10.1%, in average respectively. In exponential fitting, at 3-hour measurement we had E ranged of 51.6-69.2 mBq• m-2 • s-1 or 2.46-3.30 atom•cm-2 • s-1 with about 15% relative uncertainty. Fitting with 4-hour measurement resulted E about 51.3-68.2 mBq • m-2 • s-1 or 2.45-3.25 atom • cm-2 • s-1 with 10% relative uncertainty. The uncertainty contributions in exponential approach were 75.1%, 13.4%, 8.7%, and 2.9% for total decay constant k, fitting parameter B, V, and S, respectively. Conclusion: In obtaining exhalation rates, the linear approach is easy to apply, but by saturation feature of radon concentrations, the slope tends to decrease away from the expected slope for extended measurement time. For linear approach, measurement time of 1-hour or less was suggested. For exponential approach, the obtained exhalation rates showed similar values for any measurement time, but measurement time of 3-hour or more was suggested for about 10% relative uncertainty.

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Assessment of surface and mass exhalation rate in soil from Diamond City Surat, Gujrat, India

Saini,

Panghal,

Choudhary

et al. 2024

J Radioanal Nucl Chem

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Measurement of the radon exhalation rate from the medium surface by tracing the radon concentration

Cited by 8 publications

References 15 publications

A novel method to measure the radon exhalation rate in only one measurement cycle

A novel method to measure the radon exhalation rate in only one measurement cycle

Standard Measurement Procedure for Soil Radon Exhalation Rate and Its Uncertainty

Assessment of surface and mass exhalation rate in soil from Diamond City Surat, Gujrat, India

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