SSHCZO -- Geophysics -- Gamma Ray Logs -- Shale Hills -- (2010-2010)

Natural gamma ray logs are indicating the concentration of thorium (Th), uranium (U), and potassium (K) in the rocks surrounding a borehole and they are a measurement of the natural radioactivity of the formation. The energy of the gamma-rays (photons) differs for Th, U, and

K. Potassium emits only gamma photons of energy 1.46 MeV. Thorium emits gamma photons of a number of different energies, the highest of which is 2.62 MeV. Uranium similarly emits gamma photons of a number of different energies with 1.76 MeV as the highest energy that can be detected in a borehole. Here the values indicate total gamma ray energy and are function of well depth.

自然伽马射线测井数据揭示了围绕钻孔的岩石中钍（Th）、铀（U）和钾（K）的浓度，并反映了该地层的天然放射性。伽马射线（光子）的能量因钍、铀和钾而异。钾仅发射能量为1.46 MeV的伽马光子。钍发射多种不同能量的伽马光子，其中最高能量可达2.62 MeV。铀同样发射多种不同能量的伽马光子，可在钻孔中检测到的最高能量为1.76 MeV。此处数值代表总伽马射线能量，并随井深而变化。