Nuclear fission – the physical process by which very large atoms like uranium split into pairs of smaller atoms – is what ...

It has been observed in a laboratory that this metal apparently breaks down, but much more slowly than radium. Of a given amount of uranium only a ten-thousand-millionth part decays in a year.

Radium did not create this difficulty ... slowly accumulating at the expense of their ultimate parent, uranium. In the few cases which up to the present have been investigated, periods of enormous ...

(Radium is a radioactive metal found in uranium.) The information was kept secret. Local children also played with the ore and waste from the mine was dumped into Great Bear Lake. Dene women used ...