All 3 Uses

radiation
in
Childhood's End
(Auto-generated)

Somehow, out in space, the light of the sun had been polarized by two crossed fields so that no radiation could pass.†
Chpt 2 *
It's supposed to be shielded from all forms of radiation, isn't it?†
Chpt 4
Too hot to be white, it was a searing ghost at the frontiers of the ultra-violet, burning its planets with radiations which would be instantly lethal to all earthly forms of life.†
Chpt 18

Definitions:

(1) (radiation as in: nuclear radiation)
particles emitted by unstable atomic nuclei

Generally, radiation is discussed in terms of harmful levels of radiation that cause sickness. However, there is a normal level of radiation that is not harmful and sometimes radiation is carefully used for beneficial purposes such as medical treatments that use it to kill cancer cells.
(2) (radiation as in: electromagnetic radiation)
energy sent out as invisible rays such as from heat, light, or radio waves
(3) (meaning too rare to warrant focus)