| 摘要 |
<p>METHOD AND APPARATUS FOR GEOPHYSICAL PROSPECTING BY RADIOACTIVE DIAGRAPHY The invention relates to method and apparatus for geophysical prospecting by radioactive diagraphy of a drillhole, using a probe containing a radioactive source and one or two detectors of delayed particles emitted by the terrain bombarded by the said source. The source is moved periodically, within the probe, vertically away from the detector, and the detector is moved, in synchronism with the said source, in order to locate it opposite the zone which has just been bombarded.</p> |
