X-Rays, smoke detectors, sterilizing medical supplies, destroying cancer, CAT scans of the body.
Smoke detectors
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.
Radioactive elements.
Radio radiation is non-ionizing, meaning it does not have enough energy to remove electrons from atoms or molecules. This type of radiation is generally considered less harmful to human health compared to ionizing radiation.
If by ionising radiation you mean alpha radiation (the most ionising out of alpha, beta and gamma radiation) then about a millimetre of paper would stop it. alpha radiation ionises the molecules of anything it reaches, but can pass through very few things due to its immense ionising power. This includes human tissue, but in all honesty, a large dose of alpha radiation wouldn't do human tissue alot of good. In short, almost any material can stop ionising radiation.
mobile/cell phones microwaves radiation power lines
The IR in IRMER stands for Ionising Radiation to which the regulation relates. MRI does not employ Ionising radiation so as far as I am aware the regulation doesn't apply to MRI.
Alpha particles are ionizing radiation because they have a positive charge and can remove electrons from atoms they interact with, causing ionization. This can damage living tissues if exposure is significant.
Because it emits ionising radiation
heat or light from the sun, microwaves from an oven, X rays from an X-ray tube, and gamma rays from radioactive elements
Infrared radiation is non-ionizing, which means it does not have enough energy to remove electrons from atoms or molecules. It is considered low-energy electromagnetic radiation that can generate heat in tissues but does not have enough energy to cause ionization.
Ionising radiation from Alpha, Beta and Gamma emissions (from radioactive materials) are harmful to most organs of the body.