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DDG
DDG是一款双探头型伽马传感器，采用两个独立的屏蔽型探测系统同时可以探测两个不同方向的伽马射线强度，在保持方向性的同时讲灵敏度提升了一倍。
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DDG Specifications
P/N 206-000-000
| Detector | Scintillator Crystal (X2) | Sodium Iodide, Na(TI) |
|---|---|---|
| Photomultiplier (X2) | R3991A (Hamamatsu) | |
| Mechanical | Diameter (OD) | 1.40” |
| Length (make-up) | 22.17” | |
| Weight | 5.5 lb | |
| End Connectors | Micro-D Subminiature, 15-Pin | |
| Material | Aluminum Alloy (chassis), Tungsten (shield) | |
| Performance | Sensitivity | 0.29* CPS/API (each detector) |
| 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 (reduced accuracy) | -40°C to 200°C | |
| Heat/Cool Rate, Max. | 2.8°C (5°F) | |
| 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 | 18 mA – 22mA | |
| Output Signal | Negative Pulse | +5V to GND, 5 uSec width |
* Counts are collected with gamma tool mounted within 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)