Accession Number : ADA950838

Title :   X-Ray Image System for Nondestructive Testing of Solid Propellant Missile Case Walls and Weldments.

Descriptive Note : Quarterly progress rept. no. 4,


Personal Author(s) : Mitchell,Jay P. ; Rhoten,Merle L. ; McMaster,Robert C.

Report Date : JUN 1962

Pagination or Media Count : 50

Abstract : A television x-ray enlargement system was developed for in-motion examination of missile case materials and weldments. This system is based upon the use of small-diameter photoconductive television camera tubes as direct sensing media for penetration radiations such as x-rays. Nine identical x-ray-sensitive, one-inch diameter, camera tubes were received and evaluated. Results indicated that they have similar response characteristics, and that these tubes can be reproduced within reasonable signal output tolerances. Penetration contrast sensitivity measurements of aluminum indicate that about 1.2% sensitivity is possible through 0.720-inch thick material. Imaging tests with 1/2-inch thick steel sowed the outline of a 2% (1/2-inch) penetration with the x-ray source operating at 250 kv. at short source-object distances. Also, a television image of holes in 3/8-inch thick lead was observed by using a cobalt-60 isotope as a radiation source. Resolution tests with 0.00039-inch (about 10 microns) copper wire indicated that this size wire be visualized on the television monitor screen. (Author-PL).

Descriptors :   *Camera tubes, *Image tubes, *Nondestructive testing, *Radiography, *Rocket engine cases, Aluminum, Copper, Steel, Gamma rays, Sensitivity, Television cameras, Temperature, Welds, Wire, X ray photography, X rays

Subject Categories : Test Facilities, Equipment and Methods
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE