Apparatus and assemblies for a borehole survey instrument are provided. A radiation detector includes a photo-detector, and a scintillator optically coupled to the photo-detector wherein the scintillator is formed in at least one of a cylindrical segment shape and a truncated frustocylindrical shape.

 
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< Method of enantioselective nucleophilic addition reaction of enamide to carbonyl group and synthesis method of optically active .alpha.-hydroxy-.gamma.-keto acid ester and hydroxydiketone

> System and method for detection and identification of optical spectra
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