Tree-Ring Bulletin, Vol. 30, No. 1-4 (1970)
ABOUT THE COLLECTION
Tree-Ring Research is the peer-reviewed journal of the Tree-Ring Society. The journal was first published in 1934 under the title Tree-Ring Bulletin. In 2001, the title changed to Tree-Ring Research.
The Tree-Ring Society and the Laboratory of Tree-Ring Research at the University of Arizona partnered with the University Libraries to digitize back issues for improved searching capabilities and long-term preservation. New issues are added on an annual basis, with a rolling wall of five years.
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Tree-Ring Bulletin, Volume 30, Issues 1-4 (November 1970)Tree-Ring Society, 1970-11Contains: The Use of X-Ray Densitometric Methods in Dendrochronology, Preparation of X-Ray Negatives of Tree-Ring Specimens for Dendrochronological Analysis, and G. S. C. Tree-Ring Scanning Densitometer and Data Acquisition System
G. S. C. Tree-Ring Scanning Densitometer and Data Acquisition SystemA 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 AnalysisTechniques 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.