Well, horses do sense and perceive things at a much higher level than us humans. They have more sensitivity as they are prey animals and need this to assist their survival. As far as their being sensitive to radiation contamanation, I honestly do not know. If it were something they could smell, see, hear or percieve through their normal senses, I would definately say yes. But radiation, as I understand it, has no smell, sound, etc. Sorry, I cannot offer more on this question…..Sincerely, Franklin