Scientists admit that they have no idea that the Earth warms

Radioactive decay of uranium, thorium and potassium in the Earth's crust and mantle is the primary source, and in 2005, scientists at the KamLAND collaboration, based in Japan, the first to show that there is a way to measure the contribution directly. The trick is to catch that Kamioka Liquid-scintillator antineutrino detector KamLAND (yellow) geoneutrinos
— more precisely, geo-antineutrinos — the radiation when the decay of radioactive isotopes. KamLAND scientists have now published new figures for heat energy from the radioactive decay in the magazine Nature Geoscience.
Based on the improved sensitivity of KamLAND detector, plus several years of additional data, the new estimate is not just a "consistent" with the predictions of accepted geophysical models, but precise enough to aid in refining the models. One thing that is at least 97 percent sure that radioactive decay supplies only about half the energy of the Earth. Other sources — primordial heat left of the planet formation, and possibly others also have to consider everything. The first signal occurs when the antineutrino converts a proton into a neutron plus a positron (anti-electron), which quickly kills when it hits ordinary electrons — a process called inverse beta decay. Faint light from ionizing positron and annihilation processes, it took more than 1,800 photomultiplier at KamLAND vessel. A couple of hundred millionths of a second after the collapse of the neutron is captured by a proton in a hydrogen-rich liquid and emits gamma rays, the second signal. This "delayed coincidence" allows antineutrino interactions in contrast to the background events such as hits from cosmic rays penetrating a kilometer rock overlying the detector. It is more heat energy than the most popular BSE model suggests, but still much lower than that of the Earth. Friedman says, 'One thing is almost certain that radioactive decay is not sufficient to account for the Earth's heat. If the rest is primordial heat or from other sources is a question without an answer."The best models are likely to result when many more geoneutrino detectors are located in various locations around the world, including midocean islands where the crust is thin and local concentrations of radioactivity (not to mention nuclear reactors), at least. —Physics.org

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