Matt

The next time you are at the hospital with afew minutes to spare, go to Nuclear Medicine (probably somewhere in x-ray). They will have multiple Gamma sources and Geiger counters, this will give you some idea of the sensitivity of you personal detector.

The radiation monitors usually worn in medicine are either film badges or occasionally "crystal" rings (retrospective - they tell you how much radiation exposure you had LAST month).

X-ray machines would NOT cause detection by a Gamma detector - different type of radiation