Calibration of commercial radon and thoron monitors at stable activtiy concentrations

Röttger, A.; Honig, A.; Linzmaier, Diana

doi:10.1016/j.apradiso.2013.11.111

Cited by 18 publications

(7 citation statements)

References 6 publications

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“…The thoron concentrations and the times that the miners spend in different concentration areas will need to be considered. The only method of measuring thoron concentrations that miners are exposed to is alpha track devices, but it is not easy to discriminate between radon and thoron for these devices (Kavasi et al 2007;Rottger et al 2014); • Masks are usually not popular among miners, but this could be an effective way of reducing the thoron progeny as well as particulates that may enter the lungs; • The depth of the monazite seam may mean that parts of the resources could possibly be extracted by open pit mining; • Other factors that will reduce the thoron will be the removal of loose rocks and dust that have accumulated in the passages; and • Another possible reduction method would involve sealants as barriers 5 (Kown et al 1980) that can be applied to the passages to block the entry of thoron.…”

Section: Discussionmentioning

confidence: 99%

Pilot Study of Thoron Concentration in an Underground Thorium Mine

et al. 2022

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The Steenkampskraal mine in the Western Cape Province in South Africa provides some interesting challenges for radiation protection practitioners in view of the high thoron values encountered in this mine. The mine contains high natural thorium concentrations that lead to high thoron activity concentrations, as will be shown in this paper. The influence of ventilation has been studied, and the source term has been investigated by considering the thorium content of the rocks and the thoron exhalation. The thoron activity concentrations are around 10 kBq m−3 at a monazite seam, and the thorium exhalation is consistent with these levels. The thoron concentrations can be reduced by ventilation but not eliminated. However, the thoron progeny can probably be reduced dramatically. Issues that affect the thoron levels are also discussed. Further studies are needed, but the thoron may well not be a radiation protection problem despite the high thoron concentrations.

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Section: Discussionmentioning

confidence: 99%

Pilot Study of Thoron Concentration in an Underground Thorium Mine

et al. 2022

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“…Data logger collects measured counts and dedicated software compensate Tn progeny growing in time. The response of this device was simulated using Monte Carlo method and compared to the measuring instrument calibrated at the PTB [10].…”

Section: Characteristics Of Devicesmentioning

confidence: 99%

Comparison of Radon and Thoron Concentration Measuring Systems Among Asian Countries

Janik

Tokonami

Iwaoka

et al. 2019

IJERPH

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Comparison is an important role in the quality control and quality assurance for any measuring system. Due to the future legal regulations regarding radon levels in the air, maintaining the system quality and harmonization of results as well as validation of radon and thoron measuring systems is important. The aim of this work is to validate the degrees of equivalence and measurement precisions of the existing five radon and four thoron measuring systems located in four Asian countries (China, India, Japan and Thailand) through comparison experiment. In this project, comparison experiment was performed in order to derive the ratio between assigned value obtained from one transfer measurement device for radon and one transfer measurement device for thoron belongs to National Institutes for Quantum and Radiological Science and Technology and participants’ value from their measuring instrument. As a result, the ratio value associated with measurement uncertainty was derived for each activity concentration. Finally, measurement bias and degrees of equivalence between the assigned values and values of measurement quantity from participants’ measuring instruments were statistically analysed and presented.

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“…This method was also successfully adopted by Dersch (1998Dersch ( , 2004 and Spring et al (2006). Other methods of standardization systems for 222 Rn measurements in the atmosphere have been developed, either by measuring the gamma-emitting decay products of 222 Rn gas traceable to a 226 Ra standard reference material (SRM) (Hutchinson et al, 1992;Sakamoto et al, 2005;López-Coto et al, 2007;Röttger and Honig, 2011;Heidary et al, 2011;Kim et al, 2012;Lee et al, 2013;Röttger et al, 2014) or by using radon itself in an absolute calibration method (Busch et al, 2002;Spring et al, 2006;Cassette et al, 2006;Nedjadi et al, 2007;Sahagia et al, 2010). Critical analysis of all of these methods was done by De Felice in 2007.…”

Section: Introductionmentioning

confidence: 98%