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Geoneutrinos make their debut The KamLAND experiment in Japan has detected neutrinos produced by radioactive decays deep inside the Earth for the first time. The experiment, which is located in a mine 1000 metres below ground, has detected electron antineutrinos from the beta-decay of uranium-238 and thorium-232, and placed an upper limit on the heat generated by these processes. If the accuracy of the measurements can be improved it may be possible to use "geoneutrinos" to probe the Earth's interior (Nature 436 499).
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