The Natural Gamma, Neutron logging tool is designed for open and cased hole use. In open holes the neutron log may be converted to porosity units based on a limestone, sandstone or dolomite matrix. The tools small diameter makes it useful for logging Natural Gamma and Neutron through drill rods in cases where the hole is to unstable to be logged open hole. A 1 Curie Am241 Be source required. Natural Gamma, X-Y Inclinometers and Azimuth are optional.


Fully downhole digital
Quick automatic setup, unique tool identification
Designed for one-man operation
Can be customized to your specific needs

Properties Measured:

  1. Natural Gamma:
    2.2 x 102 mm (0.875 x 4.0 in.)
    NAI Scintillation Offset: 13.5 cm (5.3 in.)

  2. Neutron-Neutron
    He3 Detector
    25.4 mm x 152 mm (1in. x 6 in.)
    Offset: 217.5 cm (85.6 in.)

  3. Temperature
    Offset: 220.4 cm (86.8 in.)

  4. Slant Angle & Azimuth:
    3-axis magnetometer and
    2-axis inclinometer
    Offset: 213.3 cm (84 in.)


Length: 243 cm (96 in.)

Temperature: 80 C (176 F)

Diameter: 42 mm (1.625 in.)

Pressure: 292 kg/cm2 (4000 PSI)

Weight: 12.0 kg (25 lb.)

Logging Speed: 9 m/min. (30 ft./min.)

Tool Voltage Required: 36 VDC


Tool #:9058

Part #:338000A

9058 Product Description

© 2019 by Century Geophysical, L.L.C.