Common Bricks Can Be Used to Detect Past Presence of Uranium, Plutonium

“The technique laid out in our paper can take brick samples the size of a thimble and use them to identify whether a radiological source was plutonium, uranium, and so on, even if the source has been removed,” says Ryan O’Mara, a Ph.D. student at NC State and first author of the paper.

“That has clear nonproliferation applications. For example, if a facility says that it has not been making high-enriched uranium – the kind used in weapons – you could take a sample from the building itself and determine whether there had been high-enriched uranium on site.”

Researchers envision a variety of future applications as well.

The researchers think the technique may also be used to determine whether nuclear facilities are shipping out as many spent “low burnup” fuel rods as they say they are. This is significant because some facilities have secretly diverted a percentage of their low burnup fuel rods for use as feedstock that can be used to create weapons-grade plutonium.

“We’re submitting proposals to support that work, as well as work that could help us better assess public exposure in the event of a radiological incident – which would have real value in the context of emergency response,” Hayes says. “And we are already working to demonstrate that we can use the technique as a three-dimensional ‘gamma camera,’ giving us the ability to capture the dimensions of the source or sources.”