Since we've been more concerned about radiation exposure from the nuclear danger in Japan, I've found an interesting tool for you to calculate your baseline radiation exposure on a yearly basis. The EPA has put together a little quiz for us to take to get an understanding on how much radiation we get from our environment, medical testing and flying. The higher your home elevation level is, the greater the day to day radiation exposure can be. Use this interesting calculator to estimate your baseline radiation exposure and to learn of common sources of avoidable radiation. I find it particularly interesting that medical procedures is a large part of possible radiation exposures. Don't forget the x-rays you get from your dentist, to be included in your radiation assessment. Many dentists are very liberal with x-rays. After you find out your baseline radiation exposure, mine is 341 mrem, mostly from transcontinental flights, estimate what your risk is given the average radiation that you get on a year to year basis. The average American will get a dose of approximately 620 mrems on a yearly basis. Would love to hear what your thoughts are on your results.