| Exposure:
Average radiation to which humans are exposed Jackson
Hole Guide
Natural radiation: 300 milirems per year
Artificial radiation: 63 milirems per year
Sources of radiation exposure in the U.S.
Radon: 54 percent
Medical X-rays: 11 percent
Internal: 11 percent
Terrestrial: 8 percent
Cosmic: 8 percent
Nuclear medicine: 4 percent
Consumer product: 3 percent
Other: 1 percent
Source: National Council on Radiation Protection and Measurement
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