Frequent Questions

Why is there no standard for gamma radiation (rays)?

Photon emitters and gamma rays are essentially the same. Gamma ray emissions are captured in the 4 millirem/year standard for beta particles and photon emitters. By regulating the total amount of radiation absorbed by tissue from exposure to beta particles and photon emitters, EPA is essentially regulating the amount of gamma radiation to which the public is exposed.

Additional information on radionuclides is available at
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