department of labor online network radar operators

Those types of electromagnetic radiation with enough energy to ionize biological material include X-radiation and gamma radiation. This process requires interaction with high levels of electromagnetic energy. This process can produce molecular changes that can lead to damage in biological tissue, including effects on DNA, the genetic material of living organisms. 'Ionization' is a process by which electrons are stripped from atoms and molecules. Microwaves are a specific category of radio waves that can be loosely defined as radiofrequency energy at frequencies ranging from about 1 GHz to 30 GHz. The RF part of the electromagnetic spectrum is generally defined as that part of the spectrum where electromagnetic waves have frequencies in the range of about 3 kilohertz (3 kHz) to 300 gigahertz (300 GHz). One megahertz MHz equals one million cycles per second.ĭifferent forms of electromagnetic energy are categorized by their wavelengths and frequencies. The frequency of an RF signal is usually expressed in terms of a unit called the 'hertz' (abbreviated 'Hz'). The wavelength is the distance covered by one complete cycle of the electromagnetic wave, while the frequency is the number of electromagnetic waves passing a given point in one second.

Electromagnetic waves can be characterized by a wavelength and a frequency. The RF waves emanating from an antenna are generated by the movement of electrical charges in the antenna. Note that the term “radiation” does not mean “radioactive.” Often, the terms 'electromagnetic field' or 'radiofrequency field' are used to indicate the presence of electromagnetic or RF energy. They are collectively referred to as 'radiofrequency' or 'RF' energy or radiation. Taken together, all forms of electromagnetic energy are referred to as the electromagnetic 'spectrum.' Radio waves and microwaves emitted by transmitting antennas are one form of electromagnetic energy. WHAT ARE 'RADIOFREQUENCY' AND MICROWAVE RADIATION?Įlectromagnetic radiation consists of waves of electric and magnetic energy moving together ( i.e., radiating) through space at the speed of light.

Where can I obtain more information on potential health effects of radiofrequency energy?.

Can local and state governmental bodies establish limits for RF exposure?.

Which other federal agencies have responsibilities related to potential RF health effects?.

Does the FCC maintain a database that includes information on the location and technical parameters of all the towers and antennas it regulates?.

Does the FCC routinely monitor radiofrequency radiation from antennas?.

Does the FCC regulate exposure to radiation from microwave ovens, television sets and computer monitors?.

Can implanted electronic cardiac pacemakers be affected by nearby RF devices such as microwave ovens or cellular telephones?.

What is the FCC's policy on radiofrequency warning signs? For example, when should signs be posted, where should they be located and what should they say?.

Are RF emissions from amateur radio stations harmful?.

How safe are microwave and satellite antennas?.

How safe are radio antennas used for paging and 'two-way' communications? What about 'push-to-talk' radios such as 'walkie-talkies?'.

Are emissions from radio and television antennas safe?.

Are cellular and other radio towers located near homes or schools safe for residents and students?.

Are wireless and PCS towers and antennas safe?.

Can mobile phones be used safely in hospitals and near medical telemetry equipment?.

Do 'hands-free' ear pieces for mobile phones reduce exposure to RF emissions? What about mobile phone accessories that claim to shield the head from RF radiation?.

How can I obtain the specific absorption rate (SAR) value for my mobile phone?.

How safe are mobile phones? Can they cause cancer?.

Why has the FCC adopted guidelines for RF exposure?.What levels are safe for exposure to RF energy?.What research is being done on RF biological effects?.Can radiofrequency radiation cause cancer?.Can people be exposed to levels of radiofrequency radiation and microwaves that could be harmful?.What biological effects can be caused by RF energy?.How is radiofrequency radiation measured?.What is 'radiofrequency' and microwave radiation?.Frequently asked questions about the safety of radiofrequency (RF) and microwave emissions from transmitters and facilities regulated by the FCCįor further information contact the FCC's RF Safety Program at or 1-88

Department of labor online network radar operators