NGT-075-B Gamma Tools
NGT-075-B
Gamma Tools (.075” OD)
Our NGT-075-B gamma tools are the smallest diameter scintillator gamma tools available on the market today. With an outside diameter of only 0.75” they are ideally suited for mounting within the drill-collar wall to make superior directional gamma sensors. We offer three versions of the NGT-075-B with various protection options for the tool and its electronics.
Magnetic materials are kept to an absolute minimum to limit interference with closely mounted magnetometers.
NGT-075-B
(w/ Molded Electronics Protection)
P/N 204-300-000
The latest version of the NGT-075-B contains our new Molded Electronics Protection optimized for extreme drilling environments. Pre-molded pads cover and protect the top and bottom of the circuit boards, replacing the traditional protective silicone mixture poured over the boards. This new encapsulation method of the circuit boards improves reliability by dispatching excessive heat and minimizes the impact of shock and vibration to the electronics. The molded pads also improve serviceability by allowing easy removal to provide access to the electronics for inspection and repair.
NGT-075-B
(w/ Encapsulation Sleeve)
P/N 204-400-000
CBG’s Encapsulation Sleeve is offered as an alternative to traditional collar mounting methods that may be less effective at protecting gamma tools in harsh drilling environments. Our molded encapsulation sleeve insulates the entire NGT-075-B tool, including its electronics. It reduces shock and vibration by 50% on the NGT-075-B when mounted in a collar. The pre-molded sleeve consists of two pieces that are approximately 1.0” OD when assembled around the .075” gamma tool. Ribbing on the outside of the sleeve provides gripping and allows for thermal expansion. The inside of the sleeve contains precisely molded impressions of the top and bottom of the circuit boards for electronics protection.
NGT-075-B
(Original Model)
P/N 204-200-000
The Original model of the NGT-075-B remains a staple of our product offering. It has our traditional silicone mixture poured over the circuit boards that is temperature cured for shock and vibration protection.
NGT-075-B Specifications
| P/N 204-200-000 | P/N 204-300-000 | P/N 204-400-000 | ||
| Detector | Scintillator Crystal | Sodium Iodide, Na(TI) | Sodium Iodide, Na(TI) | Sodium Iodide, Na(TI) |
| Photomultiplier | R4177A (Hamamatsu) | R4177A (Hamamatsu) | R4177A (Hamamatsu) | |
| Mechanical | Diameter (OD) | 0.75” | 0.75” | 1.003″ (Sleeve)* |
| Length (make-up) | 13.7” | 13.7” | 14.215″ (Sleeve)** | |
| Weight | 8.4 oz. | 8.4 oz. | 8.4 oz. | |
| End Connectors | Flying lead (Power, GND, Output) | Flying lead (Power, GND, Output) | Flying lead (Power, GND, Output) | |
| Material | Aluminum Alloy | Aluminum Alloy | Aluminum Alloy | |
| Performance | Sensitivity | .76 CPS/API | .76 CPS/API | .76 CPS/API |
| Accuracy | +/- 5% to 300°F +/- 10% to 350°F |
+/- 5% to 300°F +/- 10% to 350°F |
+/- 5% to 300°F +/- 10% to 350°F |
|
| Environmental | Operating Temperature | 0°F to 350°F | 0°F to 350°F | 0°F to 350°F |
| Survival Temperature (reduced accuracy) | -40°F to 400°F | -40°F to 400°F | -40°F to 400°F | |
| Heat/Cool Rate, Max. | 5°F per minute | 5°F per minute | 5°F per minute | |
| Vibration (3 axis) 50-1000Hz, Random | 20G (14G RMS) | 20G (14G RMS) | 25G (18G RMS) | |
| Shock (3 axis) | 500G, 0.5ms, half-sine | 500G, 0.5ms, half-sine | 500G, 0.5ms, half-sine | |
| Power Requirements | DC Input Voltage | 17-48 VDC, 50VDC Max. | 17-48 VDC, 50VDC Max. | 17-48 VDC, 50VDC Max. |
| Tool Current | 8-11 mA | 8-11 mA | 8-11 mA | |
| Output Signal | Negative Pulse | +5V to GND, 5 uSec width | +5V to GND, 5 uSec width | +5V to GND, 5 uSec width |
* Recommended cavity diameter, 1.0″
** Recommended cavity length, 14.2″