Effect of /i value of the Measuring Accuracy of Soil Moisture by y-radiation Method
Wang Wcnyan Zhang Jianfcng Wang Zhirong (Shaanxl Institute of Mechanical Engineering)
The mass absorption coefficient of water μ plays an important role in measuring soil moisture using v-radiation method. It can directly affect the measuring accurancy of soil moisture content.Bascd on the lab experiments, this paper studies various factors affecting n value including the probe shield, the distance between probe and radiation source, the radiant intensity and the thickness of radiated objects, etc. This is different from the theoretical calculation of n value , which is always a constant for any fixed material (i.c.indcpcndent of working conditions).Thcrcfore, in order to get an accurate measurement of soil moisture, μ value must be measured under the same condition. To sum up the experiments, a rational method and the best working conditions for measuring μvalue are given in this paper.