Abstract
THE neutron moisture meter is based on the principle that hydrogen atoms, having a mass almost the same as that of neutrons and much less than that of other atoms in such media as soils, are the only atoms which reduce the kinetic energy of neutrons from high to thermal levels by collision. It is assumed that all hydrogen atoms are chemically associated with oxygen atoms in the form of water and that the detected activity of slow neutrons is proportional to the moisture content of the medium. It is recognized that an error will result if an unknown quantity of hydrogen atoms is present in some other form.
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