A gamma-ray scattering technique for estimation of density and moisture content of wood

作者：Sharma Amandeep^*; Singh Bhajan; Sandhu B S

来源：Radiation Effects and Defects in Solids-Incorporating Plasma Science and Plasma Technology, 2017, 172(3-4): 286-295.

DOI：10.1080/10420150.2017.1307193

• Gamma-rays
• Compton scattering
• spectrum unfolding
• non-destructive inspection
• wood density and moisture content

A densitometer system, operating in a non-destructive and non-invasive way, is presented to investigate the density and moisture variation in wood samples of Pinus roxburghii (known as chir pine). The inherent ability of Compton scattering can ascertain quantitative information of electron density of the target material. A well collimated beam of 662 keV gamma rays from Cs-137 radioactive source has been used to extract the information of density from interior of sample by recording scattered spectra with NaI(Tl) scintillation detector. An inverse matrix approach for unfolding of observed pulse-height distribution to a true photon spectrum is used, by choosing bin mesh (E-1/2) of 0.025 (MeV)(1/2), for the measurements of scattered spectra. The regression lines, obtained from data of scattered spectra, provide the density and moisture content of selected wood sample. The adjusted R-2 value 0.984 for fitted curve, justifies the linear dependence of scattered intensity upon wood density. Also, Compton scatter measurements results that the technique is less sensitive beyond wood thickness of similar to 110mm due to overlying scatter components in the measured spectrum.

• 出版日期2017