A simple model for automatically measuring radon exhalation rate from medium surface |
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| Institution: | 1. Department of Physics and Electronics, Hengyang Normal University, Huangbai Road 165#, Hengyang City, Hunan Province 421008, China;2. School of Nuclear Science & Technology, University of South China, Changsheng Road 28#, Hengyang City, Hunan Province 421001, China;1. Japan Atomic Energy Agency (JAEA), Fukushima Environmental Safety Center, 10-2 Fukasaku, Miharu-machi, Tamura-gun, Fukushima 963-7700, Japan;2. Japan Atomic Energy Agency (JAEA), Center for Computational Science and e-Systems, 178-4-4 Wakashiba, Kashiwa, Chiba 277-0871, Japan;3. Inspection Development Company Ltd (IDC), 3129-37 Hirahara, Muramatsu, Tokai-mura, Ibaraki 319-1112, Japan;4. Japan Atomic Energy Agency (JAEA), Collaborative Laboratories for Advanced Decommissioning Science, 2-4 Shirakata, Tokai-mura, Ibaraki 319-1195, Japan;5. Japan Atomic Energy Agency (JAEA), Fukushima Environmental Safety Center, Environmental Radiation Center, 45-169 Sukakeba, Kaibama, Haramachi-ku, Minamisoma-shi, Fukushima 975-0036, Japan;1. Politecnico di Milano, Dipartimento di Matematica, Via Bonardi, 9, 20133 Milano, Italy;2. Clifford Research Group, Faculty of Engineering and Architecture, Ghent University, Galglaan 2, 9000 Gent, Belgium;1. Centre for Nanoengineering and Tribocorrosion, School of Mining, Metallurgical and Chemical Engineering, University of Johannesburg, Johannesburg 2028, South Africa;2. The Ibarapa Polytechnic, Department of Mechanical Engineering, Faculty of Engineering, Eruwa, Oyo State 20005, Nigeria |
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| Abstract: | A simple model to measure radon exhalation rate from medium surface is developed in this paper. This model is based on a combination of the “accumulation chamber” technique and a radon monitor. The radon monitor is used to perform measurement of radon concentration evolution inside the accumulation chamber, and radon exhalation rate is evaluated via nonlinear least-square fitting of the measured data. If the flow rate of the pump is high enough, radon concentration in the detector's internal cell becomes to be equal to that in the accumulation chamber quickly, and the simple model for measuring the radon exhalation rate can be generated analytically. Generally, the pump flow rate of radon monitor is low, not satisfying the condition. We find other sufficient conditions of this simplified model. On these conditions, the radon exhalation rate can be calculated accurately through this model even the flow rate of the pump is not so high. This method can be applied to develop and improve the instruments for measuring the radon exhalation rate. |
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| Keywords: | Simple model Radon exhalation rate Sufficient condition |
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