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I am a radiological technician at Savannah River Site.  We work in some areas that are contaminated with Pu oxide.  I hear quite frequently that Pu-238 has characteristics quite unlike other types of nuclides when in the forms of surface and airborne contamination.  One I hear a lot is that the contamination can "move upwind".  I ask why this happens and they say "the generation of heat makes it move".  Others say because the particles are so light, they move in ways unlike other nuclides.  Can anyone give me any information on this, as to whether the movement characteristics are unique and if so, why?
thank you,
Jeff Cope
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