Accession Number : AD0844016

Title :   Design and Test of a Radioisotope Dual Ablation Gauge.

Descriptive Note : Final rept. Jul 67-Jun 68,

Corporate Author : TRW SYSTEMS GROUP REDONDO BEACH CA

Personal Author(s) : Lurie, Henry

Report Date : SEP 1968

Pagination or Media Count : 116

Abstract : The objective of this program was the development, fabrication, and testing of a radioisotope dual ablation gauge which could gauge ablation and erosion in the following four nozzle materials: Carbon cloth phenolic; asbestos phenolic; paper phenolic; and low density carbon felt phenolic. Ablation and erosion measurements were obtained from the external detection of radiation emanating from radioactive needles embedded in the nozzle liner materials. Each needle contained two isotopes emitting gamma radiations of different energy levels. The isotope compounds were chosen so that one erodes and the other ablates in the same manner as the surrounding ablative material. Thus, the depletion rates of the two isotopes, as detected externally to the nozzle shell, corresponded to the surface recession and char-virgin interface recession rates, respectively. (Author)

Descriptors :   (*ROCKET NOZZLES, ABLATION), (*ABLATION, TEST EQUIPMENT), RADIOACTIVE ISOTOPES, RADIATION MEASURING INSTRUMENTS, COMPOSITE MATERIALS, PHENOLIC PLASTICS, CARBON FIBERS, ASBESTOS, PAPER, EROSION, SECOND-STAGE MOTORS.

Subject Categories : Test Facilities, Equipment and Methods
      Rocket Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE