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Not necessarily.

If you are referring to the spectrum of electromagnetic

radiation like gamma, X, UV, visible, infra red, thermal,

microwave, shortwave, radio/TV waves, they are pure

energy radiation.

If you are referring to the radiation emitted by radioactive

elements you have:

Alfa radiation. Consists of high energy (kinetic energy)

helium nucleus (particles).

Beta radiation. High energy (kinetic energy) neutrons (particles).

Gamma radiation. Very small wavelength Electromagnetic

radiation (pure energy).

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12y ago
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Q: Does radiation require the presence of particles of matter?
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