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Measurement of RF Power-Absorption in Biological Specimens (10 to 100 MHz).

PB274218

Publication Date	1977
Personal Author	Greene, F. M.
Page Count	32
Abstract	A method is described for accurately determining the radio frequency (rf) power being absorbed by a biological specimen during nonionizing radiation exposure testing using the National Bureau of Standards RF Near-Field Synthesizer in the frequency range 10 to 100 megahertz. This method is based solely on measuring the forward and reflected power on the transmission line feeding the synthesizer. Commercially available rf wattmeters can be used, and an automatic data-acquisition system employed, if desired, to 'read' the meters and rapidly calculate, display, and record the rf power flow. The method has the advantage that the exact measuring point on the feed line is not critical, as it is with methods employing direct impedance measurements, and that the required measurements can be made without interfering with the exposure tests.
Keywords	Radiofrequency power Radiation measuring instruments Radiation dosage Absorption(Biology) Exposure Radiobiology Health physics Electromagnetic radiation Measurement Procedures Sensitivity Radiation hazards High frequencies Nonionizing radiation
Source Agency	National Institute of Standards and Technology National Institute for Occupational Safety and Health
NTIS Subject Category	57V - Radiobiology 68F - Radiation Pollution & Control
Corporate Authors	National Bureau of Standards, Boulder, Colo. Electromagnetics Div.; National Inst. for Occupational Safety and Health, Cincinnati, Ohio. Div.
Document Type	Technical Report
NTIS Issue Number	197805

Measurement of RF Power-Absorption in Biological Specimens (10 to 100 MHz).

Measurement of RF Power-Absorption in Biological Specimens (10 to 100 MHz).
PB274218

Publication Date	1977
Personal Author	Greene, F. M.
Page Count	32
Abstract	A method is described for accurately determining the radio frequency (rf) power being absorbed by a biological specimen during nonionizing radiation exposure testing using the National Bureau of Standards RF Near-Field Synthesizer in the frequency range 10 to 100 megahertz. This method is based solely on measuring the forward and reflected power on the transmission line feeding the synthesizer. Commercially available rf wattmeters can be used, and an automatic data-acquisition system employed, if desired, to 'read' the meters and rapidly calculate, display, and record the rf power flow. The method has the advantage that the exact measuring point on the feed line is not critical, as it is with methods employing direct impedance measurements, and that the required measurements can be made without interfering with the exposure tests.
Keywords	Radiofrequency power Radiation measuring instruments Radiation dosage Absorption(Biology) Exposure Radiobiology Health physics Electromagnetic radiation Measurement Procedures Sensitivity Radiation hazards High frequencies Nonionizing radiation
Source Agency	National Institute of Standards and Technology National Institute for Occupational Safety and Health
NTIS Subject Category	57V - Radiobiology 68F - Radiation Pollution & Control
Corporate Authors	National Bureau of Standards, Boulder, Colo. Electromagnetics Div.; National Inst. for Occupational Safety and Health, Cincinnati, Ohio. Div.
Document Type	Technical Report
NTIS Issue Number	197805