Abstract
To evaluate moisture content in wood, the dual-energy X-ray absorptiometry (DXA) method is presented in this paper. A digital detector was used to improve the accuracy of evaluation of moisture content, which reduced the error from the process of developing X-ray films and directly measured the quantity of transmitted X-ray energies. The theoretical equation of DXA method was developed using a relationship between the ratio of two reference X-ray energies (45 and 60 kV), which are referred to as k value, and the moisture content. From the theoretical result, a regression equation was derived to estimate moisture content of wood. The moisture contents were successfully estimated by the equation when the results were compared to experimentally measured moisture contents with root-mean-square error of prediction of 3.15 % in the 28.68–172.81 % moisture content range.
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