NASA NTRS · 19790023535
Coal-rock interface detector
Abstract
A coal-rock interface detector is presented which employs a radioactive source and radiation sensor. The source and sensor are separately and independently suspended and positioned against a mine surface of hydraulic pistons, which are biased from an air cushioned source of pressurized hydraulic fluid.
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Rose, S. D., Crouch, C. E., Jones, E. W.. 1979-08-21. Coal-rock interface detector. https://ntrs.nasa.gov/citations/19790023535
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