| http://www.w3.org/ns/prov#value | - Apparatus for locating in situ hydrocarbons in underground formations surrounding a borehole, comprising:a) a tool body, including a window secured in a housing made of a wear-resistant material; b) a source of light in the body arranged to illuminate a wall of the borehole through said window; and c) a detector arranged to detect fluorescent radiation from the borehole wall through said window. 2
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