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Proceedings Paper

Gamma-ray tomography in forest and tree sciences
Author(s): Adolf Habermehl; Hans-Werner Ridder
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Paper Abstract

In forestry and tree sciences computerized tomography allows the quantitative determination of the locally varying absorption coefficients for penetrating radiation within a thin slice of the trunk. The tomogram shows not only hollows, rot, knots and other defects but also the distribution of water in the invisible interior of the stem. Portable systems have been developed and built for computerized tomography of standing trees in forests and parks. They use the radio nuclide Cesium-137 as source of radiation. The MCT-3 is based on the translation-rotation- method. A bearing ring carries the shielded source of 13 GBq of Cs-137 and three scintillation detectors. The MCT-F is based on the fan-beam method and has 30 detectors. It has an inner diameter of 100 cm and a stronger source of 185 GBq. Equipment was used in forestry sciences and in tree-care to obtain information about decay, checks, heartwood formation and moisture content, for the detection of interior decay by fungi and its spread in a horizontal and vertical direction, for determining sapwood area dependent on fertilization, for evaluating development and treatment of tree wounds and for studying the influence of resin tapping on the water supply of pines.

Paper Details

Date Published: 24 October 1997
PDF: 11 pages
Proc. SPIE 3149, Developments in X-Ray Tomography, (24 October 1997); doi: 10.1117/12.279360
Show Author Affiliations
Adolf Habermehl, Philipps Univ. Marburg (Germany)
Hans-Werner Ridder, Philipps Univ. Marburg (Germany)

Published in SPIE Proceedings Vol. 3149:
Developments in X-Ray Tomography
Ulrich Bonse, Editor(s)

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