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Neutron Log. The logging tool emits neutrons, usually from Americium and Beryllium. When the neutron is absorbed by a Hydrogen atom, it emits high energy gamma rays which are measured by the tool. These measured gamma rays are related to H concentration in the formation. . Neutron Log. Almost all of the H in rock occurs as water or petroleum. Most of the water is in the pore space but some occurs in the mineral structure of clay and mica. The logging software assumes all the hydrogen is in the p273
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