Which one of the following logging methods uses a radioactive source in the sonde?

Which one of the following logging methods uses a radioactive source in the sonde?

Q. Which one of the following logging methods uses a radioactive source in the sonde?

(A) Natural Gamma ray

(B) Gamma-Gamma

(C) Natural Gamma ray spectroscopy

(D) Nuclear Magnetic Resonance (NMR)

Ans: Gamma-Gamma

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