*adjusting tinfoil*
grape minds think alike
The next question we need to ask is: Was their a tail on this agent? Were we able to track his actions and the events prior to his death?
The next question is a technical question: On Russian made devices, and you all know what I mean, what is the primary element used in the initial detonation? If polonium is not the answer, then my next point would be this: Remember the time Interpol busted the Muslim pukes with Osmium TetraChloride? What is it? Heavy metal used in conjunction with the reflective capability of a device chamber - hence it is "painted" on at time of manufacture.
Was this guy carrying the material, and not knowing what the material was opened the container - probably splashing it on him? Or did the agent have a powder, and did it contaminate his clothing hair, etc.