METHOD AND CONTAINER FOR MEASUREMENT OF SPONTANEOUS GAMMA RAY DOSE AT BOTTOM OF SEA OR LAKE

摘要

PURPOSE: To provide a measuring container which is useful to detect the boundary of geological features, the crushing zone of a fault or the like, to analyze a crushing degree and an opening degree and to analyze the continuity conditions or the like at the bottom of the sea or a lake. ;CONSTITUTION: As a detection body for a detector, the crystal of Na 1 in which the diameter and the height of a crystal are 12.7cm or higher is used. Ten or more detectors are used for one station, and a measuring container 3 is formed in such a way that its bottom face is a cylindrical shape and that its grounding part is a thin plane. The bottom of the measuring container is not dragged, measuring containers are installed at an interval of 1 to 2m on an arbitrary course 10, and the course 10 is set in such a way that a plane distribution can be analyzed. When the position of a barge 15 is to be confirmed, the bare is positioned by GPS method using two measuring instruments and by a macroscopic optical wave measuring method. When the barge 15 is to be moved and fixed, two or four winches 13 are used, the lengths of wire ropes 14 between anchors 12 and the winches 13 are adjusted so as to fixed the barge. When its position is to be confirmed, a sound wave transmitter 8 is used. When the measuring container 3 is to be lowered, a crane 16 is used, the measuring container 3 is landed so as to control its lowering speed and its lowering position while observing the bottom part of the sea with a light and a television camera and confirming the present position.;COPYRIGHT: (C)1996,JPO