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Mini Machine Milling Helium 3 Concentration

Mini Machine Milling Helium 3 Concentration

Aug 16 2014nbsp018332Helium 4 He is the second most abundant element in the known Universe after hydrogen but only makes up 52 parts per million ppm of the Earths atmosphereHelium3 3 He is an isotope of helium with two protons and one neutronIt is not radioactive and very rare on Earth 7 parts per trillion but exists in recoverable concentrations in the lunar topsoil in the top 2 3 m of lunar

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