Many thanks DC8rider.
I think I probably phrased my previous post badly re substances not in the DG Regs. I was trying to make the point that if something has obvious DG characteristics - as Caesium has - if it does not appear in the DG regs, how can one know which PG, Hazard group, ERG etc., etc. one should apply and if you don't have that info, how can it be accepted for transport by air?
I have actually done the DG course and the re-validaton and am happy with the general principles and their application but this particular instance seems to raise some questions which the 'bible' doesn't fully cover. I've since discovered why Caesium wasn't in the DG regs - I was looking at the latest version and it has been removed. However, strangely, UN 1407 still appears in the Packing group insructions. Curiouser and curiouser.....
