Meaning of RADIATION in English

ra ‧ di ‧ a ‧ tion /ˌreɪdiˈeɪʃ ə n/ BrE AmE noun [uncountable]

1 . a form of energy that comes especially from ↑ nuclear reactions, which in large amounts is very harmful to living things:

An accident at the power station could result in large amounts of radiation being released.

a lethal dose of radiation

2 . energy in the form of heat or light that is sent out as waves that you cannot see:

Sun creams work by blocking harmful ultraviolet radiation.

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COLLOCATIONS (for Meanings 1 & 2)

■ ADJECTIVES/NOUN + radiation

▪ nuclear radiation

Nuclear radiation has a devastating effect on living cells.

▪ solar radiation (=from the sun)

How can solar radiation be trapped and used?

▪ cosmic radiation (=from space)

The spacecraft is fitted with a shield to block cosmic radiation.

▪ ultraviolet/infra-red radiation (=from the light produced by the sun)

Ultraviolet radiation damages DNA in plants.

▪ gamma/alpha/beta radiation technical (=radiation given off by the atomic matter of gamma, alpha, or beta rays)

The conventional treatment for cancer is to bombard the tumour with gamma radiation.

▪ background radiation (=the radiation normally present in the environment)

In some parts of the world, background radiation is very high.

■ radiation + NOUN

▪ a radiation leak

A radiation leak occurred at a Russian nuclear power station.

▪ radiation levels

The background radiation level was normal.

■ verbs

▪ give off radiation ( also emit radiation formal ) (=produce it)

The lamps emit ultra-violet radiation.

▪ absorb radiation

It is thought that a black hole absorbs any solar radiation that reaches it.

▪ be exposed to radiation (=be put in a situation where you are not protected from harmful radiation, especially nuclear radiation )

The servicemen claimed they were illegally exposed to radiation during atomic tests.

■ phrases

▪ a dose of radiation (=an amount of radiation that someone experiences)

Workers at the site received high doses of radiation.

▪ exposure to radiation (=when someone is near to a substance that gives off harmful radiation, especially nuclear radiation)

One cause of leukaemia is exposure to radiation.

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.