<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by richard:
The quantity they are looking for might be low because they would expect that the material is shielded.
But the quantity injected into the body is extremely low. Importantly, the half-life is very short in most nuclear medicine radio pharmaceuticals. I doubt this would cause a false positive, but I am not sure.</font>
Had a thalium-imaged cardiac stress test last week and was told I would "excrete" radioactivity for a day or two. I wonder if flying the same or the next day would cause problems.
Just found an article in which measurements of radioactive potassium were done with sophisticated lab instruments. Prune juice, potatoes and bananas gave signals twice background. Dirt, on the other hand, was 8 times background. So I guess it is ok to take bananas on a plane but be sure to shower before traveling!