Q40-GR Natural Gamma
from Mt Sopris

The QL40-GRA-1000 natural gamma probe sub is an essential tool for geological logging, offering reliable natural gamma measurements. With its 22mm diameter x 73mm long Na(Th)I scintillation crystal, it is ideal for a wide range of lithology applications, including uranium exploration.

The QL40-GRA can be used as a stand-alone tool or stacked with other QL probes such as the QL40-RES (multi-point resistivity), QL40-FTC-B (temperature/fluid resistivity), and QL40-CAL (3-arm caliper). Its versatility allows for use in both cased and uncased boreholes, making it a key asset in many geophysical survey applications.

The above shows - The QL40-GRA tool features a scintillation Thallium-doped Sodium Iodide (NaI(Tl)) crystal that plays a critical role in detecting gamma radiation. When gamma rays strike the crystal, they emit pulses of light. These pulses are then amplified by a photomultiplier tube and converted into electrical pulses. The number of pulses is counted, digitized, and transmitted via the wireline to the surface acquisition system, allowing real-time gamma-ray logging. This process is critical for analyzing the presence of radioactive elements in the surrounding rock, providing valuable information for lithology interpretation and geological studies.

Operating Conditions

W - Water √
M - Mud √
D- Dry √

S - Steel √
P - PVC Borehole √
UC- Uncased √

*Centralization is not required