|Activity of a vitrified waste package during the first 800 years|
Activity of a standard vitrified waste package produced at La Hague during the first 800 years. The scale of activity expressed in TBq (one TBq equals a thousand billion becquerels) gives a good idea of just how highly active this waste is at the beginning. As the short-lived elements such as caesium-137 and strontium-90 gradually disappear, this radioactivity decays quite rapidly – all things being relative. Owing to the adopted scale, it is not possible to assess the still considerable activity of the package beyond 200 years.