Related terms:
immune disorder
industrialized world
these isotopes
allergic diseases
natural nuclear
natural radioisotopes
mineral deposit
absolute dating
gamma dose
ore bodies
nuclear chain
infectious agents
thermal neutrons
helminth
neutron activation
dose rate
radioactivity
Wikipedia sources:
Natural nuclear fission reactor
Environmental radioactivity
Hygiene hypothesis
Chernobyl compared to other radioactivity releases
Context for words:
long
lived
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