Frequent Questions

What is the relationship between exposure rate and dose rate?

Exposure rate is the amount of ionizing radiation per hour in a person’s vicinity (measured in milliRoentgen per hour, mR/h), whereas dose rate is the biological effect on the body from exposure to that radiation (measured in nanoSieverts per hour, nSv/h). As an approximation, a radiological dose rate of 1 mR/h is roughly equal to an exposure rate of 10,000 nSv/h.


For more information about typical exposures and dose rates, visit About Exposure and Dose Rates on

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