Features
- Vented sensitive volumes of 94 cm3 and 86 cm3
- Include twin-sensitive volumes
- Shadow-free transmission chambers for dose monitoring with calibration facilities
The circular plane parallel transmission chambers are used for dose monitoring in combination with calibration benches. The sensitive volumes are designed as twin-chambers with 2.5 mm measuring depth each and a diameter of 155 mm (model 786) or 148 mm (model 34014). The chamber walls and the electrodes are made of polyimide (PI) of 0.025 mm thickness each with graphite layer. The chambers are fully guarded. The external diameter of the chamber housing is 230 mm. Two holes with 6 mm threads serve for mechanical chamber fixation.
Two chamber versions are available: model 786 is used together with dosemeters having the input circuits on ground potential, and model 34014 is used together with dosemeters having the input circuits on high voltage.
Specifications
| Type of product | vented plane parallel twin-chambers |
|---|---|
| Application | dose monitoring in calibration facilities |
| Measuring quantity | exposure |
| Nominal sensitive volumes |
86 cm3 (34014)
94 cm3 (786) |
| Design | not waterproof, vented |
| Nominal response | depends on field size |
| Chamber voltage | 500 V nominal |
| Leakage current | ≤ 1 pA |
Materials and measures
| Entrance window | 3 x 0.025 mm polyimide, graphite coated |
|---|---|
| Total window area density | 3 x 3.55 mg/cm2 |
| Electrode | polyimide foil, graphite coated |
| Outer dimensions |
diameter 230 mm |
Ion collection efficiency at nominal voltage
| Max. dose rate for ≥ 99.5 % saturation ≥ 99.0 % saturation |
12.5 Gy/s |
|---|---|
| Max. dose per pulse for ≥ 99.5 % saturation ≥ 99.0 % saturation |
500 µGy
1.2 mGy |
Useful Ranges
| Radiation quality | (7.5 … 420) kV X-rays |
|---|---|
| Field size |
≤ 86 mm diameter (34014) ≤ 94 mm diameter (786) |
| Temperature | (10 … 40) °C (50 … 104) °F |
| Humidity | (10 … 80) %, max 20 g/m3 |
| Air pressure | (700 … 1060) hPa |
Parts
TN34014 Monitor chamber, connecting system BNT
TW34014 Monitor chamber, connecting system TNC
TM786 Monitor chamber, connecting system M
TB786 Monitor chamber, connecting system BNC and banana pin
Monitor chambers with smaller diameter of sensitive volume upon request
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