| 摘要 |
PURPOSE:To very accurately measure the density and water content of soil in a short time and with simple operations, by rotating a detector within a ground measuring device, centering around a radiation source in a cylinder body inserted into the soil. CONSTITUTION:A radiation source 7 of rice grain size, in which cobalt-60 emitting gamma-rays and californium-252 emitting neutrons among radioisotopes are confined, is inserted within an end of a cylinder body 2. The mounting location of a measuring device 1 is leveled, a hole is excavated with an excavator, the cylinder body 2 in which the radiation source 7 is enclosed is inserted in the hole. and the source 7 is set. As a detector 4 is rotated, the measurement is started, a dosage from the source 7 is detected, and the density and water content of the soil are operated with a computer 6 for data processing, on the basis of detected gamma-rays and neutrons. |
