Dude, the radiation it uses isn't the kind of radiation that occur from things such as Uranium, carbon, and other radioactive isotopes (which are gamma rays, alpha and beta particles). And as mentioned above, the waves exite the polar water molecules. Where the disconnect is it the question of what heat does.

Look up isomerization. It's the idea that there are molecules that are similar to THC within the plant that can be activated into THC when heated. The issue is making sure that you do not overheat it and damage the trichomes as also mentioned above.

Here's a good link. Check out what this guy says about the isomerization process.

EDIT Here's the link Robert A. Nelson: Hemp Husbandry ~ Cannabinoid Chemistry (Ch 6)