Frequent Questions

What is a normal, background exposure rate?

Background radiation exposure rates normally vary from location to location. There are many factors that influence exposure levels, including naturally occurring radionuclides in the soil and altitude. For example, the exposure rate from naturally occurring elements in rocks and soils (terrestrial radiation) ranges from less than .0006 to more than 0.0083 mR/h. Flying in a commercial aircraft has an exposure rate of approximately (0.2 mR/h). None of these are levels of particular concern for public health.

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