DGA-C High Sensitivity Focused Gamma Tool (175°C)
Now available as the FGT!
DGA-C
High Sensitivity Focused Gamma Tool (1.36” OD)
The DGA-C High Sensitivity Gamma Tool is a “shielded” gamma ideal for Azimuthal Geosteering applications. It contains a “window” that is machined out of Tungsten material that surrounds the crystal and phototube. Gamma rays emitting from the formation can enter through this window unattenuated, to be detected and counted. The DGA-C’s design increases detection sensitivity and improves visibility in low gamma activity zones. When aligned with the tool face or other physical reference, the DGA-C indicates the direction from which gamma ray energies originate.
Now available as the FGT!
DGA-C
High Sensitivity Focused Gamma Tool (1.36” OD)
The DGA-C High Sensitivity Gamma Tool is a “shielded” gamma ideal for Azimuthal Geosteering applications. It contains a “window” that is machined out of Tungsten material that surrounds the crystal and phototube. Gamma rays emitting from the formation can enter through this window unattenuated, to be detected and counted. The DGA-C’s design increases detection sensitivity and improves visibility in low gamma activity zones. When aligned with the tool face or other physical reference, the DGA-C indicates the direction from which gamma ray energies originate.
DGA-C Specifications
P/N 202-100-000
| Detector | Scintillator Crystal | Sodium Iodide, Na(TI) |
|---|---|---|
| Photomultiplier | R3991A (Hamamatsu) | |
| Mechanical | Diameter (OD) | 1.36” |
| Length (make-up) | 13.6” | |
| Weight | 3.0 lb | |
| End Connectors | Micro-D Subminiature, 15-Pin | |
| Material | Aluminum Alloy (chassis), Tungsten (shield) | |
| Performance | Sensitivity | 0.52* CPS/API |
| Front/Back Count Ratio (using source at 6”) | 14.0 using Barium-133 2.72 using Cesium-137 |
|
| Accuracy | +/- 5% to 150°C +/- 10% to 175°C |
|
| Environmental | Operating Temperature | -18°C to 175°C |
| Survival Temperature | -40°C to 200°C | |
| Heat/Cool Rate, Max. | 2.8°C (5°F) per minute | |
| Vibration (3 axis) 50-1000Hz, Random | 30G (20G RMS) | |
| Shock (3 axis) | 1000G, 0.5ms, half-sine | |
| Power Requirements | DC Input Voltage | 17-48 VDC, 50VDC Max. |
| Tool Current | 8-11 mA | |
| Output Signal | Negative Pulse | +5V to GND, 5 uSec width |
* Counts are collected with gamma tool mounted within a standard BeCu pressure barrel, (OD 1.875″, ID 1.500″). API Calibration performed with AEA Technology, QSA Inc., KUTh Field Verifier #188074, S/N 255 Radionuclides: K-40(11.7%), U-238(90 ppm), Th-232(40 ppm).