A satellite beacon or equivalent is probably more useful, attached to the source. As well as better designed containment/carriers that don't have the possibili

A satellite beacon or equivalent is probably more useful, attached to the source. As well as better designed containment/carriers that don't have the possibility of letting the radioactive source "drop out on the side of the road". Rio Tinto has remote control trucks and automated trains in WA, I know some of the people that worked on the software. I'm pretty sure that there is already a contract being let to work out a better way of handling this stuff, and perhaps automatically tracking it. Geofencing the beacon based on its expected location would also identify this sort of situation.