- 行业: Mining
- Number of terms: 33118
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The U.S. Bureau of Mines (USBM) was the primary United States Government agency conducting scientific research and disseminating information on the extraction, processing, use, and conservation of mineral resources.
Founded on May 16, 1910, through the Organic Act (Public Law 179), USBM's missions ...
A radio system for medium-range precision surveying in which the phases of two continuous-wave signals are compared. It is based on the heterodyne principle and uses low or medium frequencies. It requires a minimum number of frequencies and these frequencies usually need bear no fixed relationship with each other.
Industry:Mining
A radioactive isotope of an element used to study a process by observing the intensity of radioactivity.
Industry:Mining
A radioactive isotope of carbon having the atomic weight of 14, produced by collisions between neutrons and atmospheric nitrogen. It is useful in determining the age of 499 carbonaceous material younger than 30,000 years old.
Industry:Mining
A radioactive metallic element; one of the alkaline-earth metals. Symbol, Ra. It occurs in pitchblende ore, in carnotite sands, and in all uranium minerals.
Industry:Mining
A radioactive, silvery-white, metallic element. Symbol, U. Occurs in numerous minerals such as pitchblende, uraninite, carnotite, autunite, uranophane, davidite, and tobernite. It is also found in phosphate rock, lignite, and monazite sands. Uranium and its compounds are highly toxic, both chemically and radiologically. Uranium is of great importance as a nuclear fuel; it is used as ballast for missile reentry vehicles, as a shielding material, and for production of high-energy X-rays.
Industry:Mining
A radioactivity log employing both gamma and neutron-log curves. The neutron log should respond best to porous fluid-filled rock and the gamma best to shale markers.
Industry:Mining
A radioactivity logging method used in boreholes in which a neutron source provides neutrons that enter rock formations and induce additional gamma radiation, which is measured by use of an ionization chamber. The gamma radiation so induced is related to the hydrogen content of the rock.
Industry:Mining
A railroad car with no top, flat bottom, fixed sides, and sometimes demountable ends that is used chiefly for hauling heavy bulk materials. Compare: high side
Industry:Mining
A railroad in which the cars descend by their own weight; an inclined railroad.
Industry:Mining
