Some of the sun's rays are ionizing and some not. The portion that is not ionizing is the visible spectrum, anything with longer wavelength (infrared), and a bit of the ultraviolet spectrum. The shorter wave lengths are all ionizing.

The use of ionizing radiation in the American workplace has been substantially reduced during the last 30-40 years. As a result of that reduction, have the hazards of non-ionizing radiation used in the workplace become greater than the remaining hazards of ionizing radiation still in use? There are no readily accessible studies to tell us whether or not that has happened, and mostly it does not matter.

The important thing is to deal correctly with all the radiation hazards, ionizing and non-ionizing, that are present in each particular workplace.

Yes, alpha radiation is an ionizing radiation.

Ionizing

No.