WELLOG                            GAMMA RAY LOGGING




Everything around us emits natural gamma radiation. Gamma rays are emitted through the decay of radioactive elements. These rays are invisible, high energy rays that are capable of penetrating most other materials. Uranium, Thorium and Potassium are examples of common radioactive elements found in and on the earth. Shale and clay minerals contain larger than normal amounts of radioactive materials. Sand, sandstone, quartz and lime or limestone contain much less radioactive material.

Gamma ray logging is used in definition of coal seams, it is important to note that coal contains very low amounts of radioactive material.



Gamma ray logging tools are available for the purpose of logging natural gamma radiation. The tools contain a sensitive scintillation detector and electronics that send pulses representing detected gamma rays to the surface. A gamma ray log will show where sandstone, clay, shale and other layers are. It will show thickness of each of these zones.


More advanced forms of gamma ray detection allow WELLOG to measure the spectrum of radiation based on energy levels. Learn more about spectral gamma tools.

WELLOG uses scintillation gamma tools for accurate, sensitive measurement of gamma radiation. Gamma ray logging can be performed with down-hole SP and Single Point Resistance (SPR) in order to identify separate mineral and lithological interfaces.


WELLOG has a NEW Gamma-NAV tool! It provides gamma ray data and borehole inclination (pitch) and course.


Geiger-Mueller (GM) tubes have been in use for many years. WELLOG currently produces GM probes for measuring gamma radiation remotely. The probes have a long cable that allows the operator to measure gamma radiation from a safe distance! See our webpage on GM probes!


 For information on all WELLOG products contact WELLOG at sales@wellog.com


REVISED 11-26-2018  2003 - 2018 WELLOG All Rights Reserved