[winker]

What is the Maximum distance Raidoactive Material can be detected; either on the ground/air or water if un-shielded?

[steve86]

What is the Maximum distance Raidoactive Material can be detected; either on the ground/air or water if un-shielded?

There will be more learned responses, but gamma rays will continue on indefinitely, as will neutrons and other particles (until they hit something, such as a gamma-ray detector). WIdely rumored that U.S. satellites have the ability to detect emissions of fission/fusion weapons on the ground.

[StillProud2BeFree]

Heck if I know. It's been a LOOONNGGG time since I took my obligatory year of college physics :(

[oceanview]

it can be detected from satellite in that case.

[JustPiper]

Good to see you winker ;)The "Creed" person -g-