Features
- Ultra thin entrance window
- For low-energy photons from 8 keV to 35 keV
- Extremely small size
- Sensitive volume 0.005 cm3, vented to air
The 34013 soft X-ray chamber is used for absolute dose measurements in low-energy photon beams as used in superficial radiation therapy. The chamber’s small size enables the user to perform measurements with excellent spatial resolution. Correction factors needed for the determination of absorbed dose to water are available. The chamber is designed for the use in solid state phantoms.
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 | 0.005 cm3 |
| Design | not waterproof, vented |
| Reference point | in chamber center of entrance foil underside |
| Direction of incidence | perpendicular to chamber plane |
| Nominal response | 200 pC/Gy |
| Long-term stability | ≤ 1 % per year |
| Chamber voltage |
400 V nominal ± 400 V maximal |
| Directional response | < 5 % for chamber tilting up to ± 10° |
| Leakage current | ≤ ± 10 fA |
| Cable leakage | ≤ 1 pC/(Gy·cm) |
Materials and measures
| Entrance foil | 25 µm PE |
|---|---|
| Total Window Area Density | 2.3 mg/cm2 |
| Sensitive volume | radius 0.85 mm depth 0.75 mm |
Ion collection efficiency at nominal voltage
| Ion collection time | 0.03 ms |
|---|---|
| Max. dose rate for ≥ 99.5 % saturation ≥ 99.0 % saturation |
0.99 kGy/s |
| Max. dose per pulse for ≥ 99.5 % saturation ≥ 99.0 % saturation |
4 mGy
10 mGy |
Useful Ranges
| Chamber voltage | ± (100 … 400) V |
|---|---|
| Radiation quality | (8 … 35) keV X-rays |
| Field size | (0.5 x 0.5) 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
TN34013 Soft X-ray chamber 0.005 cm3, connecting system BNT
TW34013 Soft X-ray chamber 0.005 cm3, connecting system TNC
TM34013 Soft X-ray chamber 0.005 cm3, connecting system M
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