"Exposure to ionizing radiation" refers to being in contact with a type of energy that has the ability to cause damage to cells in our bodies. Full definition
Most of the existing policies deal with exposure to ionizing radiation. (sciencemag.org)
A dosimeter that measures exposure to ionizing radiation via the teeth is the furthest along. (scientificamerican.com)
Radiation exposure is just one cause of this scrambling (Shirley and others 1992, Gorbunova and Levy 1999) and at least 3,000 different mutant plant varieties created by intentional exposure to ionizing radiation are part of the existing food supply (IAEA 2008). (academicsreview.org)