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| | Abstract | | The development of instrument aimed at the measurement of radiation dosage in the sediment of lakes, rivers and sea bed has been carried out. We executed field tests in ponds in the Tohoku region. It was possible to grasp the radiation dosage distribution of the bottom by the gamma-ray measurement. In this field tests,high dosage sediments was distributed in the vicinity of the center of the pond. The resistivity was measured at the same,the peripheral portion was high resistivity, the central portion has tended low resistivity. In addition, we have developed small radiation measurement system which can be installed the borehole, and We executed field tests with this instrument attached to the ROV-system. |
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