In the current world we all are exposed to certain amounts of radiation, but it won't kill us. You can even go to Chornobyl for an excursion, a place where two and a half decades ago you'll die from radiation but now staying there one day you' ll get exposed to same levels of radiation as living for three months in a city. Guess that's why a friend of mine got himself a multipurpose dosimeter-radiometer, still he often visits abandoned military bases as part of his work so most probably he uses that dsimeter mainly for work