Bananas are also slightly radioactive due to the...

Microscopic amount of potassium 40 isotope.

FWIW, depending on how the Bananas are ripened, they could have added ethylene gas (Ethene for us oldies) which has a slightly sweet type smell, not sure if that's what the OP means.
It's also naturally occuring on the fruit.

Posted By: usacanary, Dec 31, 13:33:33