[alexander_busek]

[...] it is primarily plutonium dioxide (PuO2) which is airborne

Until it isn't airborne anymore (like when it falls back on Russian territory).

Yawn!

Regards,

[Chad_the_Impaler]

My point was that the only radionuclide to search for is plutonium since a destroyed missile would have undergone a chemical reaction, not a nuclear one.