Building materials radon exhalation rate: ERRICCA intercomparison exercise results

The reuse of industrial by-products is important for members of numerous industrial sectors. However, though the benefits of reuse are evident from an economical point of view, some compounds in these materials can have a negative effect on users' health.In this study, the radon emanation and exhalation features of red mud were surveyed using heattreatment (100 to 1200°C). As a result of the 1200°C-treated samples, massic radon exhalation capacity reduced from 75 ± 10 mBq kg -1 h -1 to 7 ± 4 mBq kg -1 h -1 , approximately 10% of the initial exhalation rate.To find an explanation for internal structural changes, the porosity features of the heat-treated samples were also investigated. It was found that the cumulative pore volume reduced significantly in less than 100 nm, which can explain the reduced massic exhalation capacity in the high temperature treated range mentioned above.SEM snapshots were taken of the surfaces of the samples as visual evidence for superficial morphological changes. It was found that the surface of the high temperature treated samples had changed, proving the decrement of open pores on the surface.

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“…The massic radon exhalation could be calculated using the following formula (Kovler 2006;Petropolous et al 2001;Quindos et al 1994): …”

Section: Fig 1 Closed Loop Exhalation Sampling Systemmentioning

confidence: 99%

Influencing effect of heat-treatment on radon emanation and exhalation characteristic of red mud

Sas

Szántó

Kovács

et al. 2015

Journal of Environmental Radioactivity

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“…In our case, the container free volume is more than 50 times larger than the sample pore volume, and therefore this effect can be neglected. Nevertheless, due to the leakage of radon, it was necessary to introduce an effective decay constant (λeff=λ+λleak) that corrects the decay constant for the removal of radon by leakage [12].…”

Section: The Closed-chamber Methods With An Active Devicementioning

confidence: 99%

“…Two main groups are distinguished: closedchamber methods and open-chamber methods [12]. In the closed-chamber methods a sample is enclosed in a well sealed chamber.…”

Section: Introductionmentioning

confidence: 99%

“…In the closed-chamber methods a sample is enclosed in a well sealed chamber. An increase of radon concentration in the chamber is then followed [12]. On the other hand, in the open-chamber methods measurements are performed in ventilated chambers.…”

Section: Introductionmentioning

confidence: 99%

“…A gas in a chamber is continuously exchanged with a radon free or low-radon gas using a pump with a known and constant gas exchange rate. Exhalation is extracted from the measured radon concentration and known gas exchange rate [12]. This contribution compares several closed-chamber radon exhalation methods developed or used in our Laboratory for Nuclear and Plasma Physics of the "Vinča" Institute of Nuclear Sciences.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Merits and Demerits of Different Methods for Radon Exhalation Measurements for Building Materials

Awhida¹,

Ujić²,

Kolarž³

et al. 2017

RAD Conference Proceedings

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Abstract. With an increase in the awareness of the need to save energy, residents tend to live in dwellings with increasingly tight windows and doors, thus reducing the ventilation rate of indoor air which leads to an increased accumulation of radon indoors. Having in mind that a dose from an exposure to inhaled radon and its progenies can be higher than a dose received from radium in building materials, it is suggested that radon exhalation measurements should receive due attention. In this contribution, the authors compare results gathered using a few methods for radon exhalation measurement and discuss its merits and demerits.

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Etched-Track Technique in Radon Metrology: Recent Advances and Quality Assurance

Abo-Elmagd

2024

Handbook of Quality System, Accreditation and Conformity Assessment

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Building materials radon exhalation rate: ERRICCA intercomparison exercise results

Cited by 89 publications

References 5 publications

Influencing effect of heat-treatment on radon emanation and exhalation characteristic of red mud

Influencing effect of heat-treatment on radon emanation and exhalation characteristic of red mud

Merits and Demerits of Different Methods for Radon Exhalation Measurements for Building Materials

Etched-Track Technique in Radon Metrology: Recent Advances and Quality Assurance

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