Features
- Suitable for dose measurements of diagnostic X-ray qualities in air
- Can be used down to 35 keV radiation energy
- Comes with a holding stem for mounting in the radiation field
The 30 cm3 flat chamber is especially designed for X-ray dose measurements in air down to 35 keV radiation energy. The maximal polarizing voltage is 500 V. The area density of the entrance window is 90 mg/cm2. A radioactive check device including check source and shielding is available to correct air density and carry out function tests. Using the appropriate holder, the check source can always be positioned and oriented at the same place on the chamber.
Specifications
| Type of product | vented plane-parallel ionization chamber |
|---|---|
| Application | absolute dosimetry in diagnostic radiology |
| Measuring quantities | air kerma, exposure |
| Reference radiation quality | 70 kV, HVL 2.58 mm Al (RQR5) |
| Nominal sensitive volume | 30 cm3 |
| Design | not waterproof, vented |
| Reference point | in chamber center |
| Direction of incidence plane | perpendicular to chamber |
| Nominal response | 1 µC/Gy |
| Chamber voltage | 400 V nominal ± 500 V maximal high voltage to be connected only with active current-limiting device (Imax < 0.5 mA) |
| Energy response | < ± 6 % (35 … 75) keV |
| Directional response in water | ≤ 5% for chamber tilting up to 5° |
| Leakage current |
≤ 10 fA |
| Cable leakage | ≤ 1 pC/(Gy·cm) |
Materials and measures
| Entrance window | 0.75 mm PMMA, graphite coated |
|---|---|
| Total window area density | 90 mg/cm2 |
| Electrode |
0.05 mm graphite coated polyimide foil |
| Dimension of sensitive volume |
radius 23.5 mm depth 2 x 5.98 mm |
Ion collection efficiency at nominal voltage
| Ion collection time | 0.6 ms |
|---|---|
| Max. dose rate for ≥ 99.5 % saturation ≥ 99.0 % saturation |
0.26 Gy/s |
Useful Ranges
| Chamber voltage | (300 … 500) V |
|---|---|
| Radiation quality | (35 … 75) keV X-rays |
| Temperature | (10 … 40) °C (50 … 104) °F |
| Humidity | (10 … 80) %, max 20 g/m3 |
| Air pressure |
(700 … 1060) hPa |
Parts
TN233612 Flat chamber 30 cm3, connecting system BNT
TW233612 Flat chamber 30 cm3, connecting system TNC
TM233612 Flat chamber 30 cm3, connecting system M
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