Related terms:
natural background radiation
radioactive materials
cosmic radiation
radiation dose
radiation exposure
cosmic microwave background radiation
msv
radon
ionizing radiation
Wikipedia sources:
Background radiation
Ionizing radiation
George Smoot
Astronomy
Gamma spectroscopy
Age of the universe
Bikini Atoll
Ultra-high-energy cosmic ray
Deinococcus radiodurans
Context for words:
background
radiation
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