X-ray Scanning Machine for Tree-Ring Width and Density Analyses

Authors

  • M. L. Parker
  • L. A. Jozsa

Keywords:

in-motion radiography, X-ray densitometry, specific gravity, dendrochronology, wood density, annual growth increments

Abstract

High-quality radiographs of wood samples can be produced for intra-ring specific gravity studies using an X-ray scanning machine. A hydraulic system is used to provide constant-speed and vibration-free motion for scanning tree-ring samples up to 4 feet [1.22 m] long. Stationary exposures can be made from distances of up to 7 feet [2.13 m]. Wood-sample preparation and X-ray film-processing techniques are described.

References

Eastman Kodak Co. 1969. Radiography in modern industry. Eastman Kodak Co., Radiog. Mark. Div., Rochester, N.Y. 160 pp.nEchols, R. M. 1970. Moving-slit radiography of wood samples for incremental measurements. Pages 34-36 in J. H. G. Smith and J. Worrall, eds. University of British Columbia, Faculty of Forestry, Bull. 7, Vancouver.nEchols, R. M. 1971. Patterns of wood density distribution and growth rate in ponderosa pine. Proc. Symp. Eff. Growth Accel. Prop. Wood. U.S. For. Prod. Lab. Madison, Wis. 12 pp.nHopkins, W. K. No date. In-motion radiography as viewed and applied by the Lockheed Georgia Company. Lockheed-Georgia Co., Marietta, Ga. 15 pp.nKusec, D. J. 1972. Twin-blade saw for precision machining of increment cores. Wood Fiber 4(1):44-49.nMcNeely, R., J. Neale, M. Benkel, J. Rustenburg and J. Terasmae. 1973. Studies in dendrochronology No. 1. Application of X-ray densitometry in dendrochronology. Brock Univ. Dept. Geological Sci. Res. Rept. Ser. No. 16. 30 pp.nParker, M. L. 1970. Dendrochronological techniques used by the Geological Survey of Canada. Pages 55-66 in J. H. G. Smith and J. Worrall, eds. University of British Columbia, Faculty of Forestry Bull. 7, Vancouver. (Also Geol. Surv. Can. 1971. Pap. 71-25. 30 pp.)nParker, M. L., and K. R. Meleskie. 1970. Preparation of X-ray negatives of tree-ring specimens for dendrochronological analysis. Tree-Ring Bull. 30(1-4): 11-22.nParker, M. L., J. Schoorlemmer, and L. J. Carver. 1973. A computerized scanning densitometer for automatic recording of tree-ring width and density data from X-ray negatives. Wood Fiber 5(3):237-248.nPolge, H. 1963. L'analyse densitométrique de clichés radiographiques. Ann. Éc. Natl. Eaux Forêts Stn. Rech. Expér. 20(4):533-581.nPolge, H. 1966. Établissement des courbes de variation de la densité du bois par exploration densitométrique de radiographies d'échantillons prélevés à la tarière sur des arbres vivants. Applications dans les domaines technologique et physiologique. Ann. Sci. For. 23(1):1-206.n

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Published

2007-06-05

Issue

Number 3 / Fall 1973

Section

Research Contributions

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