Non-Ionizing and Ionizing Radiation
Radiation can be categorized into two main types: non-ionizing and ionizing radiation.
Non-Ionizing Radiation
Non-ionizing radiation has enough energy to move or vibrate atoms in a molecule but not enough to remove electrons from atoms. It can generate heat in substances. Common examples include:
- Radio waves
- Microwaves
- Infrared radiation
- Visible light
Daily exposure to low levels of non-ionizing radiation is generally safe. However, high-intensity or direct exposure can damage tissue due to heat.
Ionizing Radiation
Ionizing radiation carries sufficient energy to knock electrons out of atoms, a process called ionization. Because it can alter atoms in living tissue, it poses health risks, including damage to cells and DNA.
Sources of ionizing radiation include:
- X-ray machines
- Cosmic rays from outer space
- Radioactive elements
Radioactive decay is the process by which radioactive elements emit ionizing radiation. This radiation can take several forms:
- Alpha particles
- Beta particles
- Gamma rays
Medical applications, such as radiation therapy and diagnostic x-rays, are common examples of ionizing radiation exposure in healthcare settings.