BERYLLIUM SAMPLE CELL FOR X-RAY DIFFRACTION STUDY OF LIQUIDS,
CALIFORNIA INST OF TECH PASADENA
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A cylindrical beryllium sample cell was used for a set of measurements at 100 psi. The central portion of the cell is the active sample area which is irradiated during the experiments. To the right and left are larger cylindrical sections which fit snugly into a cell holder. Those latter areas affect thermal communication between the sample and a liquid-nitrogen heat sink. The left section serves as a thermocouple well which permits positioning a thermocouple within 0.04 in. of the sample cavity. At the extreme right end of the assembly is a collar which is required for a pressure seal. This sample cell was constructed from hot extruded beryllium powder. The cell was used successfully for x-ray diffraction measurements on a sample of liquid nitrogen confined at 100 psi and -193C. An estimate of the x-ray absorption within the sample cell is obtained by considering a beam scattered from the axis of the cylindrical sample. For this case the x-ray attenuation was calculated to be 20, using a mass absorption coefficient of 1.35.