And it also ensures a homogeneous distribution of radionucleids.
The second one in based on metallic container. So what metallic container does. Is basically isolated for a few thousand of years. Or if you use, for example, a copper base then you have a very long period which can go into tens of thousands of years. And the corrosion provokes also the given referrable chemical environment for the waste.
Then you have a bentonite barrier. Now, bentonite is basically a clay, and the advantage of clay, is that it has very low hydraulic conductivity and therefore it restricts water penetration. And also it has a very low diffusivity of the fusion coefficient.
Then the next barrier is a geological barrier, where you have basically host rock, and that ensures limited water supply to this clay and to the metal. And also the host rock will give mechanical or geological stability to the whole system. In the past disposal system was designed, that each barrier will hold the nuclear waste and can support the nuclear waste, and therefore it is very expensive. So the research has been done, so that we can, instead of construing each barrier individually, the whole object is that we consider the barrier collectively and optimally design it so as to reduce cost and at the same time maintain the radioactive waste under prescribed condition.
