In reality, it is unlikely that these measures would ameliorate any perceived danger, but they are just another burden on science in Australia. The legislation affecting UA is only the latest, but arguably the best, example of bad legislation. UA is a water soluble uranium compound made from depleted uranium. Depleted uranium has small fractions of the U235 isotope removed, which could be used to make bombs. For radiation health purposes, there is no difference between depleted and non-depleted uranium.
Users usually float prepared specimen discs on a single drop of solution.
Electron scattering is atomic number dependent and since uranium is the highest naturally occurring element, it has been proven most suited. We believe that we supplied almost all UA used in Australia and much of New Zealand's too. Each jar contains 25g of powder. The compound contains about 13g of uranium per jar. Note that 1g of UA just exceeds that definition.