Accession Number : AD0019940


Title :   A SINGLE-CRYSTAL ADAPTOR FOR THE NORELCO HIGH-ANGLE DIFFRACTOMETER


Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE LAB FOR INSULATION RESEARCH


Personal Author(s) : Abrahams, S C ; Grenville-Wells, H J


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/019940.pdf


Report Date : Sep 1953


Pagination or Media Count : 6


Abstract : The adapter is based on the principle of completely bathing a small crystal in a slightly divergent collimated x-ray beam, and slowly rocking the crystal through the Bragg reflection angle while keeping the GM counter stationary at the proper 2 theta angle. The normal specimen holder is replaced by a long shaft which closely fits the bronze sleeve of the diffractometer and ends in a screw on which a Supper goniometer head can be fitted. A graduated circle is attatched to the other end of the shaft which is connected to a synchronous motor. The whole shaft can be translated along its length to bring the crystal into the x-ray beam. A Bodine motor is used to rotate the crystal at a constant angular velocity of 1/8 deg theta/min. A backstop is mounted on a sleeve which fits over the collimator shaft, and permits the counter ro record spectra with angles as low as 3 deg 2 theta.


Descriptors :   *X RAY DIFFRACTION , *SINGLE CRYSTALS , *DIFFRACTOMETERS , CRYSTALS , REFLECTION , CONSTANTS , SLEEVES , ANGULAR MOTION , BRAGG ANGLE , COLLIMATORS , BRONZE


Subject Categories : Crystallography
      Test Facilities, Equipment and Methods


Distribution Statement : APPROVED FOR PUBLIC RELEASE