Assertion: ionizing radiation | /r/CapableOf | introduce on the environment
Facets:
value: recently
type: TEMPORAL
Source sentences:
text: However, unlike radioactive ionizing radiations which has always existed in the evolution of mankind, non-ionizing radiation is mostly artificial and recently introduced on the environment, and according to scientists even very low levels of exposure to non-ionizing radiation may in the long term cause significant health effects through several biological mechanisms other than ionization.