Tritium occurs naturally as a result of cosmic radiation, if you like. We have a chart here. If you look at the first chart, it shows that the natural background radiation for all Canadians is 2.4 millisievert. There are all kinds of nuclides in the atmosphere, and they're called background radiation. And if you look at the levels, the regulatory limits, that we impose on licensees, you'll see they're well below the background radiation.
On February 24th, 2009. See this statement in context.