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| definition | API (American Petroleum Institute) unit for gamma log. The unit of radioactivity used for natural gamma ray logs. The log can be of the total gamma ray in API units, or of the spectral response in wei | ||||||
| scope note | API (American Petroleum Institute) unit for gamma log. The unit of radioactivity used for natural gamma ray logs. The log can be of the total gamma ray in API units, or of the spectral response in weight concentrations of thorium, uranium and potassium. This unit is based on an artificially radioactive concrete block at the University of Houston, USA, that is defined to have a radioactivity of 200 American Petroleum Institute (API) units. The formation is the primary standard for calibrating gamma ray logs. | ||||||
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| top concept of | uom original | ||||||