| 摘要 |
<p>PURPOSE:To make it possible to measure the flow of underground water without lifting an apparatus by branching a pipe line from the port of a tracer force-feeding pipe, applying negative pressure, and pumping up the underground water. CONSTITUTION:A directional neutron moisture meter 4 is contained in cylindrical strut 6 for linking upper and lower air packers 5a and 5b, and the directivity is controlled with a directivity controller 15. Air is sent and discharged with a packer operating device 7 into and out of the packers 5a and 5b. The packers are brought into contact with a strainer pipe 2 with pressure, and the moisture meter 4 is fixed. The moisture meter 4 can be moved by the contraction with the pipe 2. The moisture meter 4 is connected to a digital count-rate meter 8, and the concentration analysis of tracer 9 in the moisture meter 4 is performed. A hole for discharging the tracer 9 is provided at the lower part of the packer 5a and coupled with a tracer injecting device 10. A T pipe line 11 is provided at the outlet port of the device 10 and connected to a vacuum pump 13 through an underground-water sampling bottle 12. At the time of the sampling of the underground water and the time of the flow measurement, the pipe line is changed to the side of the pump 13 and the side of the device with a directional control valve.</p> |
