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Sustainability 2018, 10(8), 2937; https://doi.org/10.3390/su10082937

Laboratory Experimental Laws for the Radon Exhalation of Similar Uranium Samples with Low-Frequency Vibrations

1
School of Environment and Safety Engineering, University of South China, Hengyang 421001, China
2
Hunan Province Engineering Technology Research Center of Uranium Tailings Treatment, University of South China, Hengyang 421001, China
*
Authors to whom correspondence should be addressed.
Received: 30 May 2018 / Revised: 7 August 2018 / Accepted: 7 August 2018 / Published: 18 August 2018
(This article belongs to the Special Issue Nuclear Safety, Emergency, Security: Theory and Technology)
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Abstract

It is the fact that there are lots of hazard incidents in underground uranium mines caused by radon but in-suit uranium samples were difficult to collect. Based on closed chamber method, three similar samples in different sealed ways were made in a laboratory with different material rations, namely uranium tailings, quartz sand, cement, iron powder and silicon powder to measure the radon concentrations with and without low-frequency vibrations, which was used by the experimental device for low-frequency vibration diffusion of radon. The results showed that the radon exhalation coming from the similar samples was influenced by the low frequency vibration; the results are presented as two-stage variations compared with the blank group. The radon exhalation increased with the rising vibration frequency when the frequency was 50 to 70 Hz, but fell slowly after reaching the peak radon exhalation rate. Analyses of the relations between the rock damage degree, changes in porosity and the occurrence of an inflection point in the radon exhalation rate in the samples found that they also increased when the frequency was between 0 to 80 in sample 3. The maximum porosity of the third samples was about 4.8% with a low-frequency vibration 60 Hz, while the maximum damage degree was about 0.07 at 50 Hz. View Full-Text
Keywords: uranium; similar materials; low-frequency vibration; radon exhalation rate; porosity uranium; similar materials; low-frequency vibration; radon exhalation rate; porosity
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Cai, Z.-Q.; Li, X.-Y.; Lei, B.; Yuan, J.-F.; Hong, C.-S.; Wang, H. Laboratory Experimental Laws for the Radon Exhalation of Similar Uranium Samples with Low-Frequency Vibrations. Sustainability 2018, 10, 2937.

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