Title :
Automation of a Crawford-cell exposure system
Author :
Pucci, G.P. ; Segal, A.S. ; Magin, Richard L.
Author_Institution :
Bioacoustics Res. Lab., Univ. of Illinois, Urbana, IL, USA
Abstract :
An automated 50-Ω Crawford cell exposure system for irradiating laboratory animals in the 225-500-MHz frequency range is described. Power measurements are obtained and analyzed in this system via an HP 436A power meter under the control of an LSI-11 minicomputer. Dosimetric information, in terms of the specific absorption rate (SAR), is collected with the minicomputer automatically measuring absorbed power at preset exposure time intervals for a specified duration. Instantaneous values of SAR are computed, stored on a disk file, and displayed on a video terminal. The average whole-body SAR is computed and displayed at the end of each exposure. An interactive system-operating program facilitates data acquisition and analysis, and provides maximum flexibility and ease of operation.
Keywords :
biological effects of radiation; biological techniques and instruments; computerised instrumentation; dosimetry; power measurement; 225 to 500 MHz; Crawford-cell exposure system; HP 436A power meter; LSI-11 minicomputer; automation; biological effects of radiation; biological techniques; computerised instrumentation; data acquisition and analysis; dosimetry; interactive system-operating program; laboratory animals; specific absorption rate; Accuracy; Fluctuations; Noise; Noise measurement; Power measurement; Resistance; Transmission line measurements;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.1982.6312560
