Features
- Ultra thin entrance window
- For low-energy photons from 5 keV to 20 keV
- Sensitive volume 100 cm3, vented to air
The 34047 soft X-ray chamber is a reference chamber used in calibration laboratories. Its very thin entrance window makes it possible to measure photon radiation with energies down to 5 keV. Due to the large volume, the chamber gives reasonable and accurate signals. The chamber is designed for measurements free in air.
Specifications
| Type of product | vented plane parallel ionization chamber |
|---|---|
| Application | absolute dosimetry in low-energy photon beams |
| Measuring quantities | absorbed dose to water, air kerma, exposure |
| Reference radiation quality | 30 kV, HVL 0.37 mm Al (T30) |
| Nominal sensitive volume | 100 cm3 |
| Design | not waterproof, vented |
| Reference point | in chamber center of entrance foil underside |
| Direction of incidence | perpendicular to chamber plane |
| Nominal response | 4.8 µC/Gy |
| Long-term stability | ≤ 1 % per year |
| Chamber voltage | 400 V nominal ± 500 V maximal |
| Leakage current | ≤ ± 10 fA |
| Cable leakage | ≤ 1 pC/(Gy·cm) |
Materials and measures
| Entrance foil | 3.5 µm PET (polyethylenterephthalat), graphite coated |
|---|---|
| Total Window Area Density | 0.5 mg/cm2 |
| Sensitive volume |
radius 39.9 mm depth 20 mm |
Ion collection efficiency at nominal voltage
| Ion collection time | 6.3 ms |
|---|---|
| Max. dose rate for ≥ 99.5 % saturation ≥ 99.0 % saturation |
2.1 mGy/s 4.2 mGy/s |
Useful Ranges
| Chamber voltage | ± (300 … 400) V |
|---|---|
| Radiation quality | (5 … 20) keV X-rays |
| Field size | (15 x 15) cm2 … (40 x 40) cm2 |
| Temperature | (10 … 40) °C (50 … 104) °F |
| Humidity |
(20 … 80) %, max 20 g/m3 |
| Air pressure | (700 … 1060) hPa |
Parts
TN34047 Reference Soft X-ray chamber 100 cm3, connecting system BNT
TW34047 Reference Soft X-ray chamber 100 cm3, connecting system TNC
TM34047 Reference Soft X-ray chamber 100 cm3, connecting system M
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