Comment by dhx

Maybe covered by the following exemptions of section 3 of Nuclear Non‑Proliferation (Safeguards) Regulations 1987?[1]

  (1) For the purposes of paragraph 9(c) of the Act, each of the following kinds of nuclear material is nuclear material of a kind to which Part II of the Act does not apply:
    (c) source material that is incorporated in:
      (i) the glazing of a finished ceramic product; or
      (ii) an alloy in the form of a finished constructional product, being an alloy the source material component of which is not more than 4% by weight of uranium or thorium;
    (d) source material that is contained in:
      (i) a chemical mixture, compound or solution, or an alloy, in which the uranium or thorium content by weight is less than 0.05% of the weight of the mixture, compound, solution or alloy;

There's probably dozens of other acts and regulations which would also apply to which the exemptions above may not apply--for example, legislation related to import declarations and use of mail services.

[1] https://www.legislation.gov.au/F1996B02071/2023-10-27/2023-1...