Accession Number : AD0286925

Title :   AN INVESTIGATION OF THE USE OF RADIATION FROM RADIOISOTOPES TO MEASURE DENSITY ALTITUDE

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : RUPP,ALEXANDER KRATZ

Report Date : AUG 1962

Pagination or Media Count : 1

Abstract : All known methods that obtain density altimetry from the radiation of radioisotopes are reviewed and the results of testing one of the methods, small-angle-beta scatter, in an altitude chamber, is reported. The range of density altitude to be measured is from 100,000 to 300,000 ft, and within this range the small-angle-beta-scatter altimeter proves to offer a satisfactory theoretical solution. After small angle scatt r inAIR OCCURS, THE BETA RADIATION IS RE-COLLIMATED AND DETECTED BY AN ANTHRACENE SCINTILLATING CRYSTAL AND ASSOCIATED EL C RONIC EQUIPMENT. The count rate of the apparatus is a decreasing function with increasing al itude, and it is this observation that makes the small-angle-betascatter gage useful a an altimeter. Testing showed that final results in an altitude chamber provide readable data from 100,000 to 210,000 ft. In the conclusion it is noted that the smallangle-beta-scatter-density altimeter is esp cially suitable for mounting in hypersonic aircraft because it samples ambient air, requires no compressibility corrections, and can be located in fuselage areas of relatively low temperature that require no special protection. (Author)

Descriptors :   *ALTIMETERS, *ISOTOPES, *RADIATION EFFECTS, *RADIOACTIVE ISOTOPES, ALTITUDE CHAMBERS, BETA PARTICLES, DENSITY, SCATTERING

Distribution Statement : APPROVED FOR PUBLIC RELEASE