radiation

US /ˌrediˈeʃən/

UK /ˌreɪdiˈeɪʃn/

B1
n. (c./u.)Noun (Countable/Uncountable)Energy transmitted as rays, waves or particles
A lead vest protects me from extra radiation of the x-ray machine
n. (c./u.)Noun (Countable/Uncountable)Harmful waves of energy from nuclear activity
After the Fukushima explosion, the radiation contaminated the surroundings
n. (c./u.)Noun (Countable/Uncountable)The emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles which cause ionization.
Exposure to high levels of radiation can be harmful to human health.
n. (c./u.)Noun (Countable/Uncountable)The use of high-energy radiation to treat disease, especially cancer.
She is undergoing radiation therapy to treat her cancer.
n. (c./u.)Noun (Countable/Uncountable)The transfer of energy as electromagnetic waves without the involvement of a physical substance.
Heat transfer occurs through conduction, convection, and radiation.

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