Determination of radon emanation and back diffusion characteristics of building materials in small chamber tests
Determination of radon emanation and back diffusion characteristics of building materials in small chamber tests
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DOI：
10.1016/s0360-1323(96)00071-6
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发表时间：
1997-07-01
影响因子：
7.4
通讯作者：
Burnett, J
中科院分区：
文献类型：
--
作者：
Chao, CYH;Tung, TCW;Burnett, J
建立了一种估算不同建筑材料在小室试验中氡辐射率和反扩散率的方法。从腔室氡活度的增长曲线可以得到发射速率和反扩散速率两个参数。测量时使用体积为14900立方厘米的不透水小容器，并使用固态氡探测器连续监测室内氡水平。在这项研究中，建筑材料在室内放置了400多个小时，以达到平衡氡浓度。在实验条件下，样品的辐射速率和反扩散速率是相当恒定的。辐射速率由生长曲线的初始斜率决定，反扩散速率由活性曲线的平衡值决定。在每次实验前，通过检查腔室内的氡无衰变率来估计腔室的泄漏，并在计算中进行了修正。选取两种花岗岩和一种裸混凝土作为试验试样。第一个花岗岩样品的平均辐射速率为13.44 Bq.m（-2）。Hr(-1)，反向扩散速率为6.89 × 10(-4) Hr（-1）。第二个花岗岩样品的辐射速率为0.58 Bq.m（-2）。Hr(-1)，反扩散速率为6.18 × 10(-3) Hr -1。该方法提供了一种准确估计常用建筑材料的氡辐射和反向扩散特性的方法。1997爱思唯尔科学有限公司
A methodology has been established to estimate the radon emanation rates and back diffusion rates of different building materials in small chamber tests. The two parameters, emanation rate and back diffusion rate, can be obtained from the growth curve of the chamber radon activity. Small impervious containers with a volume of 14900 c.c. were used in the measurement and solid-state radon detectors were used to monitor the chamber radon levels continuously. In the study, the building materials were left inside the chamber for more than 400 hours in order to reach equilibrium radon concentrations. The emanation rates and the back diffusion rates of the samples were found to be fairly constant under the experimental conditions. The emanation rate was determined by the initial slope of the growth curve and the back diffusion rate was determined by the equilibrium value of the activity curve. Leakage of the chamber was estimated by checking the radon free decay rate inside the chamber before each experiment and a correction was included in the calculation. Two kinds of granite and one bare concrete were selected as test samples. The first granite sample had a mean emanation rate of 13.44 Bq.m(-2).hr(-1) and a back diffusion rate of 6.89 x 10(-4) hr(-1). The second granite sample had an emanation rate of 0.58 Bq.m(-2).hr(-1) and a back diffusion rate of 6.18 x 10(-3) hr-1. The methodology has been found to provide an accurate method of estimating radon emanation and back diffusion characteristics of commonly used building materials. (C) 1997 Elsevier Science Ltd.