Record Display for the EPA National Library Catalog


Main Title Control of Energy Absorption Rate in Transmission Line Radiofrequency Exposure Systems (Journal Version).
Author Ali, J. S. ; Elliott, D. J. ;
CORP Author Health Effects Research Lab., Research Triangle Park, NC. ;Northrop Services, Inc./Environmental Sciences, Research Triangle Park, NC.
Publisher c1987
Year Published 1987
Report Number EPA/600/J-87/418;
Stock Number PB89-105928
Additional Subjects Radio frequencies ; RF systems ; Biological radiation effects ; Animal behavior ; Radiofrequency power ; Feedback control ; Radiofrequency generators ; Exposure ; Movement ; Energy absorption ; Transmission lines ; Test equipment ; Laboratory animals ; Reprints ;
Library Call Number Additional Info Location Last
NTIS  PB89-105928 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 9p
A frequent problem in the radiofrequency (RF) irradiation of experimental animals in health effects studies is the temporal variation of the specific absorption rate (SAR) with animal movement. An RF power controller which regulates the energy absorption rate has been designed for use with transmission line exposure systems that utilize the power difference method to monitor the SAR. The controller operates by altering the incident power to the exposure cell in order to compensate for the change in RF energy absorption rate due to animal motion. A circuit diagram is presented as well as experimental data under three conditions of exposure. The controller is effective in maintaining the mean value of energy absorption rate at the setpoint value even for the case of a highly active animal. (Copyright (c) 1987 Alan R. Liss, Inc.)