The Litho-Density tool (LDT) uses a [[pad]]-mounted [[gamma ray source|gamma-ray source]] and two [[scintillation]] [[detector|detectors]] to measure the [[bulk density]] and the [[photoelectric absorption cross section index|photoelectric absorption cross section]] (P<sub>e</sub>). The P<sub>e</sub> measurement is closely related to the [[lithology]] of the formation. A spectral analysis of the detected gamma rays is used for the P<sub>e</sub> measurement and to improve the response of the density measurement. See also [[compensated formation density log]]. Litho-Density is mark of Schlumberger.

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