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cosmic radiation |
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| The National Council on Radiation Protection and Measurements (NCRP) has used the ICRP risk-based methodology to determine that radon gas accounts for two-thirds of the total natural background radiation dose based on a comparison of equivalent whole-body doses from radon and from cosmic radiation and terrestrial radionuclides (NCRP 1987). While zooming about at 40,000 feet we're exposed to 200 times more cosmic radiation than at ground level. Fabian of the University of Cambridge in England estimates the contribution of black holes to cosmic radiation based on the average density of supermassive black holes near our galaxy and the intensity of the sky's X-ray background. |
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