Accession Number : ADA297881

Title :   Technique of Resistivity Measurements on Cyclotron Bombarded Graphite,

Corporate Author : NORTH AMERICAN AVIATION INC LOS ANGELES CA

Personal Author(s) : Gilmore, F. A. ; Matmstrom, C. R. ; Jarrett, A. A.

PDF Url : ADA297881

Report Date : 04 APR 1949

Pagination or Media Count : 17

Abstract : Cyclotron bombardment of graphite with high energy charged reticles has been shown to change the physical properties of the graphite I. In particular, the electrical resistivity of the graphite is found to be greatly increased after exposure to the cyclotron beam. The affected region of the graphite is determined by the cross sectional area of the beam and the range of the particles in graphite. These dimensions are approximately as fol1ows: width of beam in vertical direction 150 mils (0.150 inch), range of deuterons 55 mils, range of alpha particles and protons 25 mils. Because the affected region is small it is necessary to make resistivity measurements on very small volumes to obtain the change in resistivity as a function of the distance along the particle path. Measurements of this type are desirable because the measurements can be compared with the effects predicted by theory as a function of total bombarding flux and beam particle energy.

Descriptors :   *GRAPHITE, *CROSS SECTIONS, *PARTICLE BEAMS, MEASUREMENT, THICKNESS, RESISTANCE, PATHS, HIGH ENERGY, PARTICLES, ALPHA PARTICLES, RETICLES, CYCLOTRONS.

Subject Categories : Nuclear Physics & Elementary Particle Physics
      Particle Accelerators

Distribution Statement : APPROVED FOR PUBLIC RELEASE