| 摘要: |
| 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。 |
| 关键词: 水的质量吸收系数,土壤含水量,测量精度,探头屏蔽 |
| DOI： |
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| Effect of μ value of the Measuring Accuracy of Soil Moisture by γ-radiation Method |
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Wang Wcnyan Zhang Jianfcng Wang Zhirong
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| Abstract: |
| The mass absorption cocmefficient of water μ plays an important role in
measuring soil moisture using γ-radiation method.It can directly affect the measuring
accurancy of soil moisture content.Based on the lab experiments,this paper studies
various factors affecting μ valuc Including tne probc Shield,the distance between Probe
and radiation source,the radiant intensity and the thickness of radiated objects,etc.
This is different from the theorctical calculation of μ value,which is always a constant
for any fixed material (i.e.independent of working conditions).Therefore,in order to get
an accurate measurement of soil moisture,μ value must be measured under the same
condition、To sum up the cxpcriments,a rational method and the best working conditions for measuring μ value are given in this paper. |
| Key words: the mass absorption coefficient of water , soil moisture content, measuring accuracy, probe shield |
