RARE GAS EXTRACTION METHOD

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PROBLEM TO BE SOLVED : To extract accurately and efficiently rare gas dissolved in gap water in a rock core by determining rationally a proper evacuation time. SOLUTION : After sealing the rock core 2 sampled from under the ground in a container 3, the container 3 is evacuated by a vacuum pump, and a pressure change in the container is detected, and in a process wherein the pressure in the container 3 is changed stepwise, evacuation is stopped simultaneously when confirming that the change has reached the fourth stage, and thereby the air around the rock core 2 is evacuated surely, and rare gas inside the rock core 2 is diffused in the container 3. Consequently, the air around the rock core 2 can be evacuated sufficiently, and a loss of the He concentration inside the rock core 2 can be suppressed to the minimum. COPYRIGHT : (C)2007, JPO&INPIT