Physicists from the University of California are using KamLAND, a liquid scintillator anti-neutrino detector, to measure heat from radioactive materials deep within the Earth. According to Robert McKeown, author of a recent paper on the subject, "Neutrinos and their corresponding antiparticles, antineutrinos, are remarkable for their ability to pass unhindered through large bodies of matter like the entire Earth, and so can give geophysicists a powerful method to access the composition of the planet's interior." The KamLAND experiment has already resulted in several breakthroughs in experimental particle physics, including the 2002 discovery that antineutrinos emitted by nuclear power plants do indeed change as they travel through space.
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