There's also the small matter that the Goiania incident involved a gamma source, and the source here is an alpha source, of which all the radiation is blocked b

There's also the small matter that the Goiania incident involved a gamma source, and the source here is an alpha source, of which all the radiation is blocked by an inch or so of air. There's some hand-waving about the source self-sputtering. It seems highly unlikely that the source a)is not coated b)is pure enough for that to be a risk Even if it did, the amount of dust generated would be so small it would be inconsequential compared to numerous natural radiation sources, including alpha emitters like radon.