We have observed cubes of concrete in storage. Those cubes have been activated by neutrons.
In those cubes we have observed the following radio-elements:
Below we see the image of 60Co activation. The activity is weak (1 MBq is seen from 4m). The activity is present in metallic rods reinforcing the concrete structure. It seems to be mostly present in a block on the background (2nd layer).
The distribution of Europium is quite different, but also mostly in a background block.
Our cameras are uniquely suited to study this kind of low level distributed contaminations.