Drilling Borehole Well Logs  

Natural gamma ray logging tool is designed to measure the formation’s natural gamma intensity and compare formation depth. The measuring probe consists of electron-multiplier phototube and NaI crystal. During measuring, the NaI crystal changes the energy of gamma ray into blinker light. The blinker light gets into the electron-multiplier phototube and generates electrical pulse. The electrical pulse is faired and enlarged, then transmitted to WTC after processed by onboard computer, and at last transmitted to the surface by cable. The counting value reflects the intensity of natural gamma.

Characteristics:

Small correlation counting fluctuation, thermos design, especially for high temperature deep well, diameter of Φ38mm and Φ43mm.

JGS-1B portable engineering logging system main parameters
1. 12 digits A/D conversion, programmable amplifier times: K=0.5~128
2. Counting channel: f≤500KHz
3. Digital signal transmission frequency: 9600bit/s 

4. Power supply period: 400ms

5. Currency: 2mA~500mA optional

6. Signal input range: ≤±10V
7. Continuous working time:≤24h
8. Power consumption: <200W
9. Volume (L*W*H): 420*260*210mm, weight:<10Kg

10. Weight:<7Kg
11. Working temperature range: -10°C~+50°C
12. Working power supply: DC12V or AC220V±10% 50Hz±5%
13. Measurement speed: 0~30m/min adjustable (upon the sampling period)