The legislation doesn't include americium, and even if it did‚ I presume it will be imported under license.

https://www.legislation.gov.au/C2004A03417/latest/text says "Nuclear material means any source or any special fissionable material as defined in Article XX of the Statute." and Article XX only mentions uranium, plutonium, and thorium.

In any case, high-schooler David Hahn showed us what's possible with a bunch of smoke detectors, camping lantern mantels, and the like. https://en.wikipedia.org/wiki/David_Hahn His lab became a Superfund site.

Many places have very different opinions on sources inside certified devices vs outside. E.g. in the US you can freely ship an americium-based smoke detector around the place. But the source extracted from it as a cool "element sample", shipping that is not okay and quite likely to get you in trouble.

Americium can’t be used to build a nuclear bomb. I think it’s entirely reasonable for a country to overreact to nuclear arms control, especially if there are escape hatches like the one used in this case to let people off the hook when deserved.

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