Change in the activity of low-level short-lived waste packages
The activity of LILW-SL packages decays relatively quickly because most of the radioactive elements the waste contains have a half-life of less than 30 years. By way of an example, the graph shows the decay of two representative waste packages delivered to the CSA LILW waste disposal facility by EDF. This time the activity is measured in gigabecquerels (GBq, or billions of becquerels) per waste package. The much lower radioactivity of a few small amounts of long-lived elements will persist in the long term. The thermal output of these waste packages is negligible.
Source Andra