Activity of a vitrified package over 1 million years
To show how the radioactivity of vitrified waste changes over a million years, a graph with a logarithmic scale on both axes is needed. Representing it this way 'magnifies' the shorter periods of time and the lower levels of activity. You can see that after 1000 years, the activity of the package has decreased by a factor of around 500. But some long-lived radioelements remain. The gradual disappearance of the radioactivity goes hand in hand with a decrease in the amount of heat being released.