Magnetic Susceptibility & Natural Gamma Probe HMG-453
The HMG-453 probe measures in magnetic channel magnetic susceptibility of rocks down the borehole profile. The susceptibility is an excellent indicator of lithology. In natural gamma channel the total gamma radiation released from potassium and the decay products of uranium and thorium (natural or man-made) ocuring in the formation surrounding the borehole is measured.
The probe can be successfully used in:
- lithology determination
- mineral exploration
- sedimentology
- contamination studies
Probe Parameters
| Diameter | 45 mm |
| Length | 160 cm |
| Weight | 5.5 kg |
| Max. Working Temperature/Pressure | 75°C/20 MPa |
| Min. No. of Cable Conductors | 2 |
| Supply Voltage Range | 30 – 45 VDC |
| Max./Nominal Current Consumption | 150/60 mADC |
| Supply Voltage Polarity | + on central cond. |
| + on central cond. | − on probe casing |
Measuring Parameters
Magnetic Channel
| Sensor | two coil system |
| Intercoil Spacing | 25 cm |
| Operating Frequency | ≈2 kHz |
| Communication (negative pulse) | 0 – 20 000 cps |
| Measuring range | 10−5 – 0.5 SI units |
| Accuracy | < 3% F.S. |
| Zero Drift | < 2.10−5 SI units/10°C |
Gamma Radiation Channels
| Detector | scintilation crystal type NaI(Tl) |
| size ø20 × 65 or ø25 × 100mm | |
| Energy range | 40 keV − 2700 keV |
Note
Probe of diameter 38 mm can also be manu- factured upon special order.
Its measuring parameters are similar to those stated above.