Prospecting of underground water by the surface detection of natural radioactivity

Ochiai, Toshiro

doi:10.5026/jgeography.81.5_307

Cited by 1 publication

(2 citation statements)

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“…The Mino Belt has several active faults, including the Atera Fault. The eastern part of the Sorachi-Ezo belt (10), which runs north-south through central Hokkaido, is a geological division different from that of the main island of Japan. To the east of the Sorachi-Ezo Belt, the Tokoro Belt (12) (a Cretaceous-Paleogene AP) and the Nemuro Belt (13) (Cretaceous-Cenozoic sedimentary rocks of the Kuril Arc) are distributed.…”

Section: Selection Of Known Fault Test Sites In Japanmentioning

confidence: 99%

“…However, it was difficult to investigate a wide area of faults of interest with the α-ray analysis technology at that time. Therefore, Ochiai [10] developed a vehicle-mounted scintillation counter that can continuously measure γ-rays as a Radon index on the ground based on the assumption of the radiation equilibrium of uranium series nuclides. He estimated locations on the faults for bedrock groundwater extraction wells from sequences of γ-ray anomalies.…”

Section: Introductionmentioning

confidence: 99%

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Gamma-Ray Spectrometry in Radioactive Prospecting: Application Tool as Detecting Fault Trace

Masayuki

2023

Gamma Rays - Current Insights

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In order to clarify the possibility of fault detection by gamma-ray spectrometry (GRS), radioactivity prospecting including soil radon gas survey, etc., was carried out on already-known faults of four areas included active faults. As a result, it was shown that it is possible to detect fault traces with the following three indices: (1) the continuity of anomaly points with an increasing rate Bi/Tl above the threshold defined for each study area. (2) The continuity of peak points of non-diffusive radon. (3) The continuity of conversion points where the average value changes in the stepped fluctuation pattern of nuclide and nuclide ratio. The index of (1) was near all four faults within 0–30 m of the known fault location. All fault-related anomalies of the index (1) were formed by local maxima in Bi and local minima or decreasing trends of Tl. Therefore, it is difficult to detect faults using only total gamma ray measuring equipment such as survey meters, which has been done so far. In order to continue to develop analysis technology for GRS, in addition to accurate GRS measurements, it is also necessary to develop analysis technology using Artificial Intelligence (AI) technology, etc.

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Section: Selection Of Known Fault Test Sites In Japanmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%