Revision for Measuring the Radon Exhalation Rate From the Medium Surface

Tan, Yanliang; Xiao, Detao

doi:10.1109/tns.2010.2090897

Cited by 32 publications

(26 citation statements)

References 12 publications

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“…3 for Rosa Limbara, the activity growth was modeled for all samples by using the nonlinear least squares fitting of the experimental data with Eq. (2) [20][21][22]. The resulting parameters λ e and C m allowed the calculation of the exhalation rate (E Rn ), according to Eq.…”

Section: Measurement Of Radon Exhalation Ratesmentioning

confidence: 99%

Natural radioactivity and radon exhalation rate of Sardinian dimension stones

Dentoni

Pelo

Aghdam

et al. 2020

Construction and Building Materials

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Due to the ever-growing public concern about radon risk arising from building materials, the radon exhalation rates and the natural radioactivity of eighteen dimension stones mostly used in Sardinia and widely exported worldwide have been estimated by means of laboratory tests. Some of the quarrying companies that operate within the Sardinian territory provided the samples to be tested, which include twelve granitoids, four pyroclastic rocks and two basalts. The Activity Concentration Index (I ɤ ), the External Radiation Hazard Index (H ex ) and the Radium equivalent activity (Ra eq ) were calculated for each rock sample under investigation, based on the estimated values of 222 Rn exhalation rate and 226 Ra, 232 Th and 40 K radioactivity concentration. A poor correlation between radon release rates and 226 Ra radioactivity concentrations was found. The contribution to indoor radon accumulation was also simulated for the stone with the highest 222 Rn exhalation rate and the resulting concentration compared with the limit value establish by the 2013/59/Euratom Directive. These findings can be extended to rocks formed in similar geodynamic settings that are likely to produce igneous rocks with similar petrographic and geochemical features.

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Section: Measurement Of Radon Exhalation Ratesmentioning

confidence: 99%

Natural radioactivity and radon exhalation rate of Sardinian dimension stones

Dentoni

Pelo

Aghdam

et al. 2020

Construction and Building Materials

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“…The radon concentration in the ventilation-type chamber can be determined by the following differential equation: where C V (t) is the radon concentration in the ventilation-type chamber; C E is the radon concentration of outdoor air; J is the radon exhalation rate; S is the area of the bottom of the chamber; V is the volume of the ventilation-type chamber and it equals 4 liter; L is the ow rate of the pump; and l eff is the effective decay constant (the summation of decay constant, back-diffusion coefficient, and chamber leakage coefficient) of radon. [9][10][11][12][13] Given the decay constant of radon is only 2.1 Â 10 À6 s À1 , the leakage and back diffusion greatly inuence the equilibrium radon concentration. Fig.…”

Section: Methodsmentioning

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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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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“…After a certain time of pumping, the radon concentration in internal cell of RAD7 equals to that of the environment C0. Equation (2) can be rewritten as: [34,35] …”

Section: The Measurement Principle Of Rad7mentioning

confidence: 99%

The Estimation of Dose Relationships for the Inhalation of Radon and the Difference in Activities During the Year Using RAD7 in Iraq

Al-Bakhat¹,

Mohammed²,

Nafae³

et al. 2017

SJEE

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Exposure to radon and its daughters is one of the important contributions for radiation doses to the publics. In this study, concentrations of radon gas were measured in air at Al-Tuwaitha Nuclear Site and some surrounding areas. Measurements were achieved by RAD7 (radon detector), manufactured by DURRIDGE COMPANY Inc. Indoor radon concentration plays a vital role in the total effective dose in the indoor environments. The measurement of the indoor radon concentrations ranged from (4.96±4.4 to 102±25) Bq/m 3 this high value of radon has been found at Decommissioning Directorate /emergency room, which is lower than the action value recommended by the EPA (Environmental Protection Agency) which is (148 Bq/m 3 ) while the lowest value has been founded in the Central Laboratories Directorate \ models Room. These values were used to calculate the annual effective dose, the dose exposed to the soft tissues other than the lungs D soft tissue , the dose rate due to alpha-radiation D lung and the effective dose equivalent rate H eff . The values of the annual effective doses for 222 Rn inhalation by the people were calculated and ranged from (0.124992 to 2.5704) mSv/y these result are lower than the value of (10 mSv/y) recommended by the ICRP (International Commission on Radiological Protection). It has been observed that winter concentration of indoor radon are greater than summer concentrations. The higher amount in the winter is attributed to the observation that people normally keep their windows closed during the winter, allowing indoor radon concentrations to rise. The lower radon concentrations in the summer might occur because people often open their windows, allowing low-radon outside air to enter the home. The results from this study show that the region has background radioactivity levels within the natural limits.

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Revision for Measuring the Radon Exhalation Rate From the Medium Surface

Cited by 32 publications

References 12 publications

Natural radioactivity and radon exhalation rate of Sardinian dimension stones

Natural radioactivity and radon exhalation rate of Sardinian dimension stones

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

The Estimation of Dose Relationships for the Inhalation of Radon and the Difference in Activities During the Year Using RAD7 in Iraq

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