Adsorption of 85Kr radioactive inert gas into hardening mixtures
Adsorption of 85Kr radioactive inert gas into hardening mixtures
复制标题
DOI：
10.1007/s10967-010-0691-5
复制
发表时间：
2011-01-01
影响因子：
1.6
通讯作者：
Kleiza, J.
中科院分区：
文献类型：
--
作者：
Butkus, D.;Kleiza, J.
大气中放射性惰性气体Kr-85的体积活度发生变化：在过去15年中增加了约50%。这种气体的主要来源是核电站和乏核燃料后处理厂的运行。Kr-85作为一种惰性气体在整个大气中扩散，其电离辐射可引起大气电现象的变化。因此，有必要控制Kr-85向大气中的排放。然而，没有有效的方法，因为在正常条件下，惰性气体很难被不同的吸附剂吸附并在特殊容器中长时间储存。本文试图通过改变Kr-85的聚集状态来证明其在吸附剂中保持更长时间的可能性：气体被吸附到液体吸附剂中，而解吸发生在固体吸附剂上。为此，使用环氧树脂，在室温下加入特殊硬化剂后，变成密度约为1.2 x 10（3）kg m（-3）的固体材料。由于样品与有助于提高Kr-85溶解度的物质混合，该气体的扩散系数（即解吸速度）在固态吸附剂内发生变化。
Changes in volumetric activity of Kr-85 radioactive inert gas take place in the atmosphere: it has increased by around 50% during the past 15 years. The main source of such gas is the operation of nuclear power plants and spent nuclear fuel reprocessing plants. Kr-85 as an inert gas spreads throughout the entire atmosphere and its ionizing radiation may result in changes of atmospheric electric phenomena. Therefore it is necessary to control Kr-85 emission into the atmosphere. However, there is no effective method for this as inert gases, under normal conditions, can hardly be adsorbed in different adsorbents and stored in special containers for a long period of time. This paper tries to show the possibility of keeping Kr-85 longer within the adsorbent by changing its aggregate state: gas is adsorbed into liquid adsorbent and desorption takes place from solid adsorbent. For this purpose, an epoxy resin is used which, after adding a special hardener at room temperature, turns into a solid material with density of around 1.2 x 10(3) kg m(-3). As a result of sample blending with substances which contribute to better solubility of Kr-85, diffusion coefficient of this gas (i.e. desorption speed) changes within the adsorbent in the solid state.