Dictionary of Human Evolution and Biology

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Background Radiation

Mutagenic, carcinogenic and teratogenic radioactivity from both cosmic and terrestrial sources that constantly bombards all organisms. Background radiation averages 0.5-1.0 microcoulombs per kilogram (2-4 milliroentgens) per week, and 77.5 c kg-1 (300 milliroentgens) per week is considered the maximum permissible dose.

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