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Introduction What is radiation ?
Radiation is the process of emitting energy through a medium or space in the form of waves or particles
Ionizing and Non-Ionizing Radiation • Radiation is classified as being either non-
ionizing or ionizing.• Non ionizing radiation is longer
wavelength/lower frequency lower energy. • While ionizing radiation is short
wavelength/high frequency higher energy.(STUDY GUIDE)
Introduction
Introduction
What is Ionizing Radiation?
Type of radiation that has sufficient energy to knock-out electrons in atoms and molecules
electron
• Types of Non-Ionizing Radiation 1. (extremely low frequency) 2. Radio Frequencies 3. Microwave Frequencies 4. Lasers 5. Infrared 6. Visible Spectrum 7. Ultraviolet This list is in order of lowest to highest frequency .
Introduction
Sources of Radiation
• 1. Natural Sources of Radiation (Radioactive materials)
-Radioactive materials continuously emit radiation. -Cannot be turned OFF. - Radon gas (55%)• is the second leading cause of lung cancer in the
United States after smoking.
Introduction
• Sources
2. Radiation emitting devices or equipment (e.g. X-ray machines) -Machines can be turned ON and OFF • When turned OFF, no radiation is emitted. 3. Man-made sources. -Nuclear reactors -Medicine (Modern Health Care) -Food & agriculture -Industry -Nuclear weapons
Introduction