Radiation is a fact of everyday life. It cannot be eliminated, only reduced to acceptable levels. The state of Wisconsin works to minimize the public's unnecessary exposure to radiation through several programs.

Radiation is either ionizing or non-ionizing, depending on how it affects matter.

Non-ionizing radiation includes visible light, heat, radar, microwaves, and radio waves. It deposits energy in materials it passes through.

Ionizing radiation, such as x-rays, consists of ejected particles and released energy from unstable isotopes.

The four main types of radiation are alpha, beta, gamma and neutron.

Below is the symbol for radiation.

Radiation Warning Symbol

Radiation Warning Symbol

Questions are welcome on all aspects of radiation protection. Please select the Radiation Contacts link on the left sidebar for Radiation Protection Section staff contact information.

Last Revised: January 21, 2016