Hogg
Apologies for butting in, but you have got me intrigued. My co-instructors and myself 'do' DG as part of the 744 package, so we have an interest in this particular thread.
We have found a reference to Cesium(alternative spelling Caesium) in the ERG document but not in the DG regulations. The ERG gives a UN of 1407 and a drill code of 4W. HOWEVER, that UN number does not appear in the DG 'bible' nor does the proper shipping name of CESIUM or CAESIUM. The other versions (C.hydroxide, C. hydroxide solution and C. nitrate)2682, 2681, 1451 respectively do appear but not the ordinary variety.
The W bit of the 4W drill code is the "dangerous when wet" indicator, so being presented with this stuff in a card box in the wet would be a very big No-No for this little chicken.
Finally, as I understand it, if the substance doesn't appear in the DG regs book, it cannot be carried
Would appreciate any follow-up info.