Accession Number : ADA316275

Title :   A High Temperature Precision X-Ray Camera; Some Measurements of the Thermal Coefficients of Expansion of Beryllium,

Corporate Author : TECHNICAL INFORMATION SERVICE (AEC) OAK RIDGE TN

Personal Author(s) : Gordon, Paul

PDF Url : ADA316275

Report Date : 01 OCT 1948

Pagination or Media Count : 36

Abstract : A high temperature precision x-ray camera has been designed and constructed by modification of the familar back reflection symmetrical focussing type of camera. The camera, specimen and furnace are used within a vacuum chamber to avoid oxidation. The apparatus in its present form his been employed at temperatures up to 1000 deg C, but higher temperatures could be easily attained by making a few minor changes in the furnace materials. The lattice parameters of beryllium have been measured up to 1000 deg C. The derived coefficients of thermal expansion, both linear and bulk, are presented as a function of temperature. In addition, the data present strong evidence that the hexagonal close packed form of beryllium which exists at room temperature is stable up to at least 1000 deg C, contrary to several reports in the literature.

Descriptors :   *HIGH TEMPERATURE, *THERMAL EXPANSION, *CAMERAS, *BERYLLIUM, *X RAY PHOTOGRAPHY, THERMAL PROPERTIES, MATERIALS, VACUUM CHAMBERS, ROOM TEMPERATURE, OXIDATION, COEFFICIENTS, FURNACES.

Subject Categories : Inorganic Chemistry
      Physical Chemistry
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE