Legal thresholds for radiation exposure vary by country, and by person--pregnant women have lower thresholds, for example. For an a young male in the United States who works with nuclear materials, the legal limit is 5 rem per year.
By comparison, the human body emits about 0.039 rem annually, due to naturally present radioactive isotopes. Radon gas in a typical house accounts for 0.2 rem of exposure annually.
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Legal thresholds for radiation exposure vary by country, and by person--pregnant women have lower thresholds, for example. For an a young male in the United States who works with nuclear materials, the legal limit is 5 rem per year.
By comparison, the human body emits about 0.039 rem annually, due to naturally present radioactive isotopes. Radon gas in a typical house accounts for 0.2 rem of exposure annually.