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,S <br />uclei contained in the <br />~rium family and the <br />liation is expressed in <br />spectroscopy can be <br />sent. <br />(GR) coming from a <br />tce covered from their <br />I level of radioactivity <br />(6 to 10")around the <br />xistence of casing and <br />a interpretation o(the <br />a scintillation crystal <br />used previously. The <br />is averaged in a circuit <br />ensity. Naturally, the <br />Iled up the tvell. <br />ales the SP log. The <br />the clay content of <br />eenerally Rave weak <br />ned eranite can cause <br />(4.1) <br />Fig. 4.1. -Example of gamma ray log• SP correlation. <br />(Schlumberger document) <br />