Neutron attenuation coefficients for non-invasive quantification of wood properties
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David Mannes
Abstract
Attenuation coefficients and mass attenuation coefficients of wood were determined theoretically and experimentally for thermal and cold neutrons. Experiments were carried out at the neutron imaging facilities at the Paul Scherrer Institute, Villigen (CH). For the calculation of theoretical attenuation coefficients, only the three main elemental components (carbon, oxygen and hydrogen) were taken into consideration. While hydrogen accounts only for 6% (by wt) of wood, over 90% of the attenuation can be attributed to this element. Nitrogen and other trace elements were estimated to have a negligible impact on the theoretical attenuation coefficient. For the experimental determination of the attenuation coefficients, samples from different European and tropical wood species were tested in order to examine the influence of density and extractives content. Experimental results show a very strong linear correlation between attenuation coefficient and wood density irrespective of the tested species and extractives content that play only a minor role. As neutrons are very susceptible to scattering, it is necessary to apply a scattering correction if a quantitative evaluation is intended.
©2009 by Walter de Gruyter Berlin New York
Artikel in diesem Heft
- Original Papers
- 2D-NMR (HSQC) difference spectra between specifically 13C-enriched and unenriched protolignin of Ginkgo biloba obtained in the solution state of whole cell wall material
- Colour in thermally modified wood of beech, Norway spruce and Scots pine. Part 1: Colour evolution and colour changes
- Colour in thermally modified wood of beech, Norway spruce and Scots pine. Part 2: Property predictions from colour changes
- The relationship found between fibre length and viscosity of three different commercial kraft pulps
- High-yield kraft pulping of Eucalyptus grandis Hill ex Maiden biotreated by Ceriporiopsis subvermispora under two different culture conditions
- Analysis of microwave vs. thermally assisted grafting of poly(methyl-vinyl ether co-maleic acid)-polyethylene glycol to birch kraft pulp
- Selective enzyme impregnation of chips to reduce specific refining energy in alkaline peroxide mechanical pulping
- Radical chain reactions in pyrolytic cleavage of the ether linkages of lignin model dimers and a trimer
- Quantitative chemical indicators to assess the gradation of compression wood
- Comparison of mechanical properties of thermally modified wood at growth ring and cell wall level by means of instrumented indentation tests
- Revisiting the transition between juvenile and mature wood: a comparison of fibre length, microfibril angle and relative wood density in lodgepole pine
- Characterization of the wood quality of pernambuco (Caesalpinia echinata Lam) by measurements of density, extractives content, microfibril angle, stiffness, color, and NIR spectroscopy
- An improved drying model for highly-impermeable hardwoods
- Neutron attenuation coefficients for non-invasive quantification of wood properties
- Topochemical investigations of cell walls in developing xylem of beech (Fagus sylvatica L.)
- Effects of substrate on laboratory spalting of sugar maple
- Short Notes
- Apigenin derivatives from Paulownia tomentosa Steud. var. tomentosa stem barks
- Forming limits for the bulk forming of solid wood
- Meetings
- Meetings
Artikel in diesem Heft
- Original Papers
- 2D-NMR (HSQC) difference spectra between specifically 13C-enriched and unenriched protolignin of Ginkgo biloba obtained in the solution state of whole cell wall material
- Colour in thermally modified wood of beech, Norway spruce and Scots pine. Part 1: Colour evolution and colour changes
- Colour in thermally modified wood of beech, Norway spruce and Scots pine. Part 2: Property predictions from colour changes
- The relationship found between fibre length and viscosity of three different commercial kraft pulps
- High-yield kraft pulping of Eucalyptus grandis Hill ex Maiden biotreated by Ceriporiopsis subvermispora under two different culture conditions
- Analysis of microwave vs. thermally assisted grafting of poly(methyl-vinyl ether co-maleic acid)-polyethylene glycol to birch kraft pulp
- Selective enzyme impregnation of chips to reduce specific refining energy in alkaline peroxide mechanical pulping
- Radical chain reactions in pyrolytic cleavage of the ether linkages of lignin model dimers and a trimer
- Quantitative chemical indicators to assess the gradation of compression wood
- Comparison of mechanical properties of thermally modified wood at growth ring and cell wall level by means of instrumented indentation tests
- Revisiting the transition between juvenile and mature wood: a comparison of fibre length, microfibril angle and relative wood density in lodgepole pine
- Characterization of the wood quality of pernambuco (Caesalpinia echinata Lam) by measurements of density, extractives content, microfibril angle, stiffness, color, and NIR spectroscopy
- An improved drying model for highly-impermeable hardwoods
- Neutron attenuation coefficients for non-invasive quantification of wood properties
- Topochemical investigations of cell walls in developing xylem of beech (Fagus sylvatica L.)
- Effects of substrate on laboratory spalting of sugar maple
- Short Notes
- Apigenin derivatives from Paulownia tomentosa Steud. var. tomentosa stem barks
- Forming limits for the bulk forming of solid wood
- Meetings
- Meetings
