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The term "Rays" is really a misnomer. Gamma rays are rays, alpha and beta "rays" are particles. They get lumped together, but there is an important distinction.
It's like the difference between the sun's rays ( meaning light ) and solar "wind". Solar wind is particles and solar "rays" is just sunlight ( plus some light that isn't visible ). The difference is this: rays have no mass, but particles do.
The video doesn't make that clear enough, in my opinion. There really shouldn't be any confusion about this distinction.
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