Gentlemen,
With all due respect to those who have commented here, RAD tolerant or RAD hardened cameras are very very specifically engineered and are designed to function in a variety of RAD environments that are generally incredibly hostile.
Knowing what type and level of radiation is in the area of concern is also key to selecting an appropriate camera system.
ATEX or Explosion Proof or Intrinsically Safe ratings refer to combustible atmosphere usage only and have no bearing whatsoever to RAD tolerance. These ratings simply make the enclosures certifiably gas-tight.
Simply building a camera system and hoping it is going to work without exhaustive testing in a RAD environment is not a solution. In addition, the nuclear world is more regulated than any other environment you can imagine. No nuclear plant operator is going to deploy any commercial camera where a RAD hardened solution is required.
Please contact me privately if you have any interest in discussing this in more detail.
robert@worldwidesecurity.ca