DGA-C High Sensitivity Focused Gamma Tool (175°C)

Now available as the FGT!

DGA-C

High Sensitivity Focused Gamma Tool (1.36” OD)

PN 202-100-000_DGA-C-800x503

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)

PN 202-100-000_DGA-C-800x503

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).

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