Is that a bottle of plutonium in your pocket or are you just happy to see me

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The Times reports on the discovery of a discarded jug containing a very small amount of plutonium found at the Hanford production facility. This part is pretty cool, though:
Through isotopic analysis, reactor simulations and other techniques, Dr. Schwantes and his team determined when the plutonium was separated and which reactor provided the fuel. Since every reactor produces spent fuel with a unique "fingerprint" of small variations in isotopic concentrations, similar analyses could help investigators determine the source of material for a terrorist bomb.

The researchers also demonstrated how another isotopic signature could be used to calculate when an amount of plutonium had been split from a larger batch, and how big the original batch was. That could aid in determining whether a seized amount of plutonium represented only part of a larger cache.

Overview here (original article here, but behind paywall). I'd seen this in The Sum of All Fears but I didn't know it actually worked. The coolest part is that they are able to detect when you divide a sample. It turns out that Sodium 22 production depends on the amount of Pu in the sample, so you can use it to model the history of the sample, including the size of the original sample.

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Since every reactor produces spent fuel with a unique "fingerprint" of small variations in isotopic concentrations, similar analyses could help investigators determine the source of material for a terrorist bomb.

This would be a fingerprint similar to the anthrax terrorist acts, right? The press doesn't follow it much, but they still aren't sure where that anthrax originated.

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