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用γ射线透射法研究土壤水分特性是精确而有效的。Soane 报道用双能宽束γ射线同时测量土壤含水量和土壤密度。Corey 等借助组合双源通过一个1cm 准直孔对前法作了改进,并测定和校正了高能光子的康普顿峰对低能峰的影响。但双源双能法可能产生源的定位及恰当的准直等问题。本研究采用单源双能法,即由~(203)Hg 源得到74keV 和279keV 的γ射线。该法在对土壤水分和密度的研究中得到验证。
It is accurate and effective to study the characteristics of soil moisture by γ-ray transmission method. Soane reports that simultaneous measurement of soil moisture content and soil density with dual-energy beam wide beam gamma rays. Corey et al. Improved the front approach by combining dual sources through a 1 cm collimation hole and determined and corrected the effect of the Compton peak of high energy photons on the low energy peak. However, dual-source dual-energy method may produce the source of positioning and the appropriate alignment and other issues. In this study, single-source dual-energy method was used to obtain 74keV and 279keV γ-rays from ~ (203) Hg source. The method is validated in studies of soil moisture and density.