You haven't said what kind of infrared radiation or what the source is. People who need to worry about this usually work with infrared lasers, mostly near-infrared. For that there is safety training and equipment. Infrared detector card. read more
Infrared radiation is non-ionizing and is safe at low intensity, so keep the intensity low. Most people know to not stand too close to a red-hot furnace - they can feel their skin burning. Near IR lasers present a particular hazard since they can be focussed by the eye and damage the retina yet are invisible. read more
Most infrared radiation is not visible and may affect a person without his knowledge. Similarly, some radiation is neither hot nor colored, making them difficult for people to detect and avoid. In the electromagnetic spectrum, infrared rays are just below visible red light. read more