2 planes contaminated etc

looks like I was wrong and 2 guys have been poisoned with Po....
The Sunday times had a really good article yesterday- apparently this stuff is seriously hard to handle as its so energetic that bits spall off and jump around as it decays, which explains why so many places have been found to be contaminated with alpha emitting radiation , ie if its in the open air , then bits get out .
It follows that the couriers must have been contamimated also [ you can't enter a restaurant or wherever in full safety gear] .
As 5 rooms in a hotel have been found to be contaminated , one does wonder how - and stating the obvious - why the cleaner of those rooms has not been checked ?