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• ELF- Extremely Low Frequency electric protection societies in the world. IRPA Microwaves -The portion of the electro- and magnetic fields, such as those which recommendations form part of the World magnetic spec nan abae very high frequencies emanate from a high-tension power line. Health Organization's Environmental (VHF)and below infrared(heat)rays. Health Criteria Programme,which the Federal Communications Commission Milliwatt-One ane thousandth of a watt. (FCC) -The independent federal regulatory United Nathan Environment Programme Funds. The International Labour Office and NCRP-The National Council on Agency charged with administering the radio doe Commission of the European Communities spectrum for civilian aalso support IRPAs cold state governmental Radiation Protection and Measurements,a activities. nonprofit corporation chartered by Congress uses. Kilohertz(kHz) -One thousand hertz; in 1964 to collect,analyze,develop.and Feedback-The rerouting of a portion of an formerly one kilocycle per second. disseminate information and recornmenda- amplifier's output signal brick to the input, tions about radiation protection. primarily for the purpose of reducing any Lines of Force-The components of an Nonionizing Emissions-Radio waves, distortion introduced by the amplifier or elecric or magnetic field. sustaining oscillation. infrared rays and visible light rays, none of Magnetic Field-A way to describe the which can affect an atom's electrical balance. Field-A way to describe the spatial distrib- spatial distribution of a magnetic force.The ution of a contactless physical force such as field can arise from a permanent magnet,an NEPA The National Environmental gravity, magnetism, or electric force. electromagnet, or a flow of charged electric Policy Act of 1969.An Act of Congress particles.Measured in amperes per meter, iieres per meter,ar iperes per which requires Federal Agencies to take into Filtering-The use of an electronic circuit to consideration the potential environmental mllampmcroam pass a signal with a desired frequency or to meter. effects of a particular proposal such as suppress a signal with an undesired frequency. construction of a radio station. Magnetic Force-A force which attracts • FM Broadcast-The radio broadcast service Nondirectional Antenna-An antenna which or steel, which attracts or repels a per- which provides high-fidelity stereo music and manenrane or which that transmits and receives equally well in all bendsthepath other forms of entertainment programming in s 1. , de t electromagnet, direction, usually in one plane;also called the frequency band from 88 to 108 MHz. of moving, decrial/charges. Whether the force is repulsive or attractive an omnidirectional antenna. Frequency-The number of times an electric depends of the Polarities of the underlying Nonthermal Exposure-See Athermal or magnetic field changes polarity in one magnetic field and the pommy of the affect Exposure. second. magnet. Whether(and if so,how) the force affects moving electric panicles depends on Ohm-The fundamental unit of electrical Full Duplex-A method of two-way radio the geometry between the magnetic field and resistance. or telephone communications in which both the panicles path. parties to a conversation may transmit Omnidirectional Antenna-See Nandir- (speak) at the same time. Megahertz (MHz)-One million hertz; ectiorwi Antenna. formerly one megacycle per second. Oscillator-An electronic circuit which Hertz(Hz)-One hertz is the frequency of an electric or magnetic field which changes Microcell-A cellular base station with very generates an audio-frequency or radio- polarity once each second;formerly one cycle low otapta power designed to cover a very frequency signal without requiring an input per second. limited area,such as a shopping center or sib. Interference -Full or partial disruption of sports stadium. Picard'-A cellular base station with the reception of a desired signal or of the Microwatt-One one-millionth of a watt. rely low outPut power designed to operation of electronic product. cover an extremely small area,such as one Microwave Hearing-A perceived soundfloor of an office Ionizing Emissions-Ultraviolet rays,X in the presence of certain pulsed electromag- rays, and gamma rays,all of which can neat fields,due to physical vibranons set up Power Amplifier-An electronic device affect an atom's electrical balance. in the inner ear by those fields. There is no which generates a substantial amours of out- 0 actual external sound,and the experience in pro Power when driven by an input signal of IRPA-The International Radiation and of itself has no permanent consequences sufficient strength. Protection Association,a nongovernmental on a person's hearing. international organization whose membership includes most of the national radiation- 39