Neutrino flux measurements from the Earth's core ( see kamLAND ) show the source of about two-thirds of the heat in the inner core is the radioactive decay of 40 K, uranium and thorium.
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KamLAND is located at an average flux-weighted distance of approximately 180 kilometers from the reactors, which makes it sensitive to the mixing of neutrinos associated with large mixing angle ( LMA ) solutions to the solar neutrino problem.
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KamLAND's detector consists of a giant oil-filled balloon buried in a mine shaft . The vast majority of neutrinos pass straight through undetected, but occasionally one crashes into a proton in the oil, producing a flash of light.
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In neutrino experiments, large underground liquid scintillator detectors record the flashes of light generated from this interaction . geoneutrino measurements at two sites, as reported by the KamLAND and Borexino collaborations, have begun to place constraints on the amount of radiogenic heating in the Earth's interior.
