IMPROVEMENTS IN OR RELATING TO METHODS AND APPARATUS FOR DETERMINING THE ECCENTRICITY OF TWO NORMALLY CONCENTRIC CYLINDERS OF DIFFERENT MATERIALS

Patent · Thu Sep 01 04:00:00 EDT 1960

OSTI ID:4124369

Putman, J L

A method is described for determining the eccentricity of two nominally concentric cylinders of different materials without cutting and can be used to test the concentricity of insulating sheath and conductor in insulated cables. The method consists of passing a divergent pair of collimated gamma beams through the sheath and comparing the transmitted beam intensities, the angle of the beams being adjusted so that, if the conductor is concentric with the sheath, the beams just intersect the edges of the conductor. The apparatus for putting this method into effect comprises a lead block with cavities for the cable and radioactive source (Tm/sup 170/) with diverging holes running from the source through the cable cavity to the surface, where the beams are detected with Geiger counters. Another pair of diverging holes with associated radioactive source may be located in the lead block with their mean direction at right angles to that of the first pair. (D.L.C.)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-15-000381
• OSTI ID: 4124369
• Report Number(s): GB 847129
• Country of Publication: United Kingdom
• Language: English

Related Subjects

BEAMS
COATING
CYLINDERS
DETECTION
EFFICIENCY
ELECTRIC CONDUCTIVITY
ENGINEERING AND EQUIPMENT
GAMMA RADIATION
GEIGER-MUELLER COUNTERS
LABORATORY EQUIPMENT
LEAD
LENSES
MATERIALS TESTING
RADIATION DOSES
RADIATION SOURCES
SHIELDING MATERIALS
SURFACES
THULIUM 170
USES