• G. S. C. Tree-Ring Scanning Densitometer and Data Acquisition System

      Jones, F. W.; Parker, M. L. (Tree-Ring Society, 1970-11)
      A tree-ring scanning densitometer and data acquisition system has been built by the Geological Survey of Canada to extract tree-ring density and tree-ring width data from dendrochronological specimens and X-ray negatives of specimens. The system produces tree-ring density plots, ring density and ring-width bar graphs, and printed and punch tape digital data. This prototype was built primarily from commercial pre-constructed electronic components, but a modified densitometer and other original-design units also were used in the construction.
    • Preparation of X-Ray Negatives of Tree-Ring Specimens for Dendrochronological Analysis

      Parker, M. L.; Meleskie, K. R.; Division of Quaternary Research and Geomorphology, Geological Survey of Canada; Nondestructive Testing Section, Physical Metallurgy Division, Mines Branch (Tree-Ring Society, 1970-11)
      Techniques for producing X-ray negatives of dendrochronological specimens have been developed at the Geological Survey of Canada and the Nondestructive Testing Laboratory, Mines Branch, The radiographs are produced to provide tree-ring density data to supplement ring-width measurements for dating and climatic studies. New specimen preparation techniques and X-ray methods are discussed. The quality and quantity of tree-ring information is enhanced by the use of X-ray analysis.