However, radiation isn't "natural".
I wonder what is the real reason it is not used, maybe it decomposes the food after a while?
Apparently it is used in some cases ( very interesting [0] ), but looks like the fear is still big.
[0]:https://en.wikipedia.org/wiki/Food_irradiation
http://www-naweb.iaea.org/napc/iachem/Brochure%20on%20gamma%...
However, radiation isn't "natural".