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水的质量吸收系数μ在γ透射法测定土壤含水量中起着重要的作用,它直接影响着含水量的测量精度。本文通过室内试验研究了影响μ值的各种因素,如探头屏蔽状况、探头与放射源间的距离,放射强度以及被探测物体的厚度等。和理论计算不同,对同一确定的材料,μ值的测量结果并不总是常数(依赖于上述诸因素)。所以要得到土壤含水量的一个精确测量,首先要在同样条件下测定μ值。作为对试验的总结,本文给出一种合理测量μ值的方法和最佳工作条件。
The mass absorption coefficient μ of water plays an important role in the determination of soil water content by γ transmission method, which directly affects the measurement accuracy of water content. In this paper, various factors that influence the value of μ, such as the shielding status of the probe, the distance between the probe and the radioactive source, the radiation intensity and the thickness of the detected object, are studied through laboratory experiments. Unlike theoretical calculations, the measurement of μ is not always constant (depending on the above factors) for the same material. So to get an accurate measurement of soil moisture content, we must first determine the μ value under the same conditions. As a summary of the experiment, this article gives a reasonable method of measuring μ values and the best working conditions.