re: #242 Flyers1974

Maybe Ludwig can answer that. Couldn’t physicists tell where a bomb came from by the type of material used?

Yes. All nuclear reactors are a little different and so are all processing techniques. As a result, when you assemble a bomb there will be different levels of trace elements in your fissionable material. The reactor here meant a little more polonium or a little more of that isotope, the reactor there got it’s uranium from a different mine , so there was more or less of something else.

All you need to do is a spectral analysis to see what is in there.

In many ways this is analogous to identifying a murder weapon by ballistics.