Accession Number : AD0429439


Title :   SPECTRAL RESPONSE STUDY OF AERIAL SURVEY METER.


Descriptive Note : Final rept.


Corporate Author : EON CORP BROOKLYN N Y


Report Date : Dec 1963


Pagination or Media Count : 47


Abstract : 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 r/hr, 1 r/hr and 10 r/hr). 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)


Descriptors :   *RADIATION MEASURING INSTRUMENTS , *IONIZATION GAGES , DETECTORS , CALIBRATION , DETECTORS , GAMMA RAYS , AIRBORNE , LIFE EXPECTANCY(SERVICE LIFE) , STABILITY , ALUMINUM , SHIELDING , TIME , CESIUM , MEASURING INSTRUMENTS


Distribution Statement : APPROVED FOR PUBLIC RELEASE