Journal
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
Volume 328, Issue 1, Pages 39-47Publisher
SPRINGER
DOI: 10.1007/s10967-020-07544-4
Keywords
Rn-222 exhalation; Temperature difference; Water content; Concrete block; Grey prediction model
Funding
- National Natural Science Foundation of China [U1867221]
- Natural Science Foundation of Hunan province of China [2020JJ6004]
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The study found that temperature difference and water content in concrete have significant effects on Rn-222 exhalation rate, with varying rates observed under different conditions.
Effects of temperature difference between indoor air and concrete, and water content in concrete, on Rn-222 exhalation were investigated. In concrete with 0% water content, the heat generated due to temperature difference between concrete and indoor air could raise Rn-222 exhalation rate by 2.6 times. The Rn-222 exhalation rate rose initially, then declined as water content in concrete was increased. The maximum Rn-222 exhalation rate was 4.4 mBq m(-1) s(-1) in concrete with 10% water content. A grey prediction model was established for predicting Rn-222 exhalation rates and exposure doses of residents due to different indoor temperature differences with concrete.
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