Why can lead plate isolate radiation? What is radiation made of?

Because of the high density of lead plate, the gap between lead plate particles is very small, which is smaller than the ultraviolet spectrum length, that is, the spectrum length generated by radiation, so that the wavelength of radiation cannot pass through the lead plate, so radiation can be isolated.

1) Some people say that radiation is released by a stream of microscopic particles.

2) All kinds of visible light, including the original light and all kinds of polychromatic light synthesized by the original light, then the ultraviolet spectrum will also be combined with all kinds of visible light to synthesize all kinds of electromagnetic waves. The harm of ultraviolet rays to human body is said to be electromagnetic waves radiated by the sun. Similarly, the harm caused by nuclear radiation is ultraviolet rays, that is, electromagnetic waves, not particle flow.