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Non Ionizing Radiation

Most people think of ionizing radiation when they hear the word “radiation.”  Radiation is one of several ways energy is transferred.  If the energy is great enough to create ions, then the radiation is capable of causing damage to biological material and causing other health effects, such as radiation sickness, genetic defects, and cancer.  If the radiant energy transferred is not enough to cause ionization, then this radiation is called non-ionizing radiation.  Nonionizing radiation can also cause damage to living material, primarily by heating effects. Examples of nonionizing radiation are listed below along with web addresses of organizations that may have useful information:

OSHA Nonionizing radiation Regulations: http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=STANDARDS&p_id=10627&p_text_version=FALSE

Occupational Safety and  Health Administration    http://www.oshaslc.gov/SLTC/radiofrequencyradiation/rfpresentation/nonionizing/nonionizing2handout.html

Radiofrequency (RF) waves are in the upper spectrum of the electromagnetic waves.  They are used primarily for communications, such as radio, television, cell phones and other services.  The Federal Communications Commission (FCC) regulates the use of RF by assigning frequencies and power limitations to their licensees.  RF radiation levels used in these applications are safe for the general public; there are some precautions that occupational workers need to observe, particularly while working near transmitting antennas.

Federal Communications Commission http://www.fcc.gov/oet/rfsafety

Occupational Safety & Health Administration  http://www.osha-slc.gov/SLTC/radiofrequencyradiation/index.html

FDA Cell Phone page  http://www.fda.gov/cellphones/

Medical College of Wisconsin  http://www.mcw.edu/gcrc/cop/cell-phone-health-FAQ/toc.htm

Microwaves and radar are high frequency RF waves and have applications in telephone communications, satellite communications, navigation, law enforcement, and aeronautics.  The FCC also regulates this spectrum of the RF as well.   Again the RF levels used in these applications are safe for the general public, there are some precautions that occupational workers need to observe, particularly while working near transmitting antennas, or the waveguides.  There are other applications not related to communications and therefore not regulated by the FCC.  For example there are RF sealers that are used to seal plastic wrappers in packaging, or medical devices used to heat portions of the body.

Electromagnetic Force (EMF) occurs whenever there is an electrical current and associated with an electric field is also a magnetic field.  During the past two decades there have been reports suggesting that high voltage electric transmission lines may cause leukemia in children and other biological effects. 

National Institute of Health http://www.niehs.nih.gov/health/topics/agents/emf/

Magnetic Resonance Imaging uses a very strong magnet and a RF coil to transmit a signal that flips the protons in the hydrogen atoms to become all aligned in the same direction.  The RF coil then becomes a radio receiver to detect how many hydrogen atoms return to their original spin direction.  The concentration of hydrogen atoms in this medical imaging technique assists physicians to identify certain medical conditions.  There are no known ill health effects from strong magnetic fields; however, there is a missile hazard.  Patients with metal implants may experience some localized heating from the RF coils.  Loose metal objects can be drawn to the magnet at high velocities.  Also magnetic storage devices may become damaged, such as credit and bank cards with magnetic strips. 

Ultraviolet light (UV) in tanning may damage the skin and prematurely age the skin.  UV may also cause skin cancer.  The US Food and Drug Administration regulates the manufacture of tanning lamps and medical tanning lamps. 

FDA Center for Devices and Radiological Health (Sunlamps) http://www.fda.gov/cdrh/radhlth/sunlamp.html

FDA Center for Devices and Radiological Health  (Tanning) http://www.fda.gov/cdrh/consumer/tanning.html

Federal Trade Commission  http://www.ftc.gov/bcp/conline/pubs/health/indootan.htm

VDH Cancer Prevention Program   http://www.vahealth.org/cancerprevention/index.htm

Lasers are devices that modify light to form a powerful beam of energy capable of causing biological damage.  Lasers are classified by their wavelength and energy, which provides a reference to judge their potential danger.  Lasers have applications in industry, medicine, communications, entertainment and research.  Improper use of a laser may cause blindness.  Lasers used in surgery also create a hazard to health care personnel from the vaporization of biological material if the area is not well ventilated. 

University of Texas Environmental Health & Safety  http://www.utexas.edu/safety/ehs/radiation/lasers.html

Ultrasound is a high frequency sound wave transmitted in water or biological tissue. Low energy ultrasound has application in medicine as a diagnostic imaging technique, particularly in obstetrics, and cardiology.  There are no known ill health effects from diagnostic ultrasound; however, all medical procedures incur a risk.  High power ultrasound waves are used to break up kidney stones instead of surgically removing the stones.


Radiological Health Program | James Madison Building, 7th Floor | 109 Governor Street,  Room 730 | Richmond, VA  23219 | Telephone (804) 864-8150 | Fax: (804) 864-8155


Last Updated: 07-30-2011

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