In any industrial project, from petroleum to coal mines, you name it, there are what are known as “planned emissions”. In our business it is controlled, it is monitored, it is measured. In other words, we set the boundary of what is acceptable in the operation.
These boundaries are set by the international scientific and medical community. It's the health community that tells us what is an appropriate level; it is not us. We adopt these, we put them in place and we impose them, and then we add some more safety factors to them.
For example, the real or true impact on the health of the public and the environment is yet another measure, and it's called millisievert. If the allowable health impact is one millisievert, all of our standard behaviour is that as long as you are below that level, there are very low risks to health.
I don't know, Dr. Thompson, if you want to add to that.
All our operations in Canada are based on this particular health-related standard.