When something is gamma sterilized its subjected to 40 kGy.This is 4,000,000 RAD or 40 J / gm absorbed dose.
This toasts the programming on many programmed IC devices youmight want to sterilize. Ethylene oxide and autoclaving areNOT a problem, but gamma is nice.
Not surprising that bugs' DNA is toast after 40J/gm.
Lots of things are gamma sterilized, from band-aids up.

For a brief week in 2007, I got to study radiation, cryptography,and medical devices, three tech interests.

Very cool. Will probably end up using Atmel Cryptomemory chip.