SPECTRAL RESPONSE STUDY OF AERIAL SURVEY METER.
EON CORP BROOKLYN N Y
Pagination or Media Count:
This report presents the results of a spectral response study and calibration of the aerial survey meter over the energy range 80 kev to 1.2 mev. The meter utilizes three separate detectors to provide three ranges 0.1 rhr, 1 rhr and 10 rhr. Each of these detectors was successfully corrected for spectral response to within the required plus or minus 10. Drawings and specifications for each detector shield were developed. It seems feasible to have these detectors supplied with built-in spectral correction for ASM application. Unexpected difficulty was encountered in this task because many of the detectors proved to be unstable in operation as a function of time. This is a serious situation and may result in dangerous inaccuracy of measured results. It is recommended that the tube specifications be revised to include active and shelf life requirements that stability sampling tests be performed on all detectors prior to initial installation in aerial survey meters that the test circuitry be made to reflect the actual mode of operation in the equipment and that the stringent shock and vibration requirements which now appear in the equipment specification be made a part of the detector specifications to prevent acceptance of mechanically fragile detectors. Author