GB/T 41485-2022 (English Version) PDF

Scope: This document is applicable to the geophysical density logging tool, which mainly consists of the following parts: --- The logging probe for the directional radioisotope (gamma) source and the detector for measuring scattered gamma rays used only in the measurement; --- Cable winches and cables equipped with depth controllers; --- Other related components (power supply, pulse converter/amplifier, rate meter, recorder, signal processing and data reading unit). This document defines terms, specifies the composition of equipment, design and general technical requirements, radiation, electrical, mechanical and environmental special performance requirements, testing and calibration procedures, including electrical safety and radiation protection. In addition, recommendations are made for the relevant content in the manufacturer's operation and maintenance manual (or certificate). The purpose of this document is to give the design requirements and performance characteristics of logging tools for in situ determination of formation density. Formation lithology can be divided and porosity can be calculated by appropriate response curves.

GB/T 41485-2022 Referenced Document

IEC 60359 Electrical and electronic measurement equipment - Expression of performance

2022 GB/T 41485-2022 Nuclear instrumentation—Geophysical borehole instrumentation to determine rock density