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E DIN IEC 61874 VDE 0412-21:2025-10

Nuclear instrumentation

Geophysical borehole instrumentation to determine rock density ('density logging')

(IEC 45/1004/CDV:2025); Text in German and English
Class/Status: Draft, valid
Released: 2025 -10   Published: 2025-09 -26
VDE Art. No.: 1400649
End of objection deadline: 2025-11-26

Note: You can pre-order this document (delivery subject to availability). Valid from 2025-10-01.

This document applies to equipment consisting of a borehole logging probe equipped with a collimated gamma source and a detector unit to measure scattered gamma radiation, a coaxial cable with winch and depth control and other devices like power supply, pulse converter/amplifier, recorder, signal processing and readout units. It defines the terminology and specifies the types of apparatus, design and general technical requirements, specific radiation performance, electrical, mechanical and environmental performance requirements.