Features
- Vented sensitive volumes of 1 liter and 10 liters
- Suitable for survey meter calibration and low level measurements
- Superior energy response, reproducibility, directional dependence and long-term stability
- Radioactive check device (option)
The spherical chambers are designed for the measurement of ionizing radiation in the protection level range from 0.1 mSv/h to 0.3 Sv/h (model 32002) and in the low level range from 10 µSv/h to 30 mSv/h (model 32003). Superior features make the chambers suitable as standard chambers for calibration purposes. They fulfill the requirement for excellent reproducibility and long-term stability of the sensitive volumes. The spherical construction ensures a nearly uniform response to radiation from every direction. The energy response is very flat. This is achieved by the thin layer of aluminum on the inner wall surface, which provides for an increased photoelectric yield to compensate for the absorption of soft X-rays. The outer chamber diameters are 140 mm and 276 mm.
Specifications
| Type of product | vented spherical ionization chamber |
|---|---|
| Application | radiation protection measurements |
| Measuring quantity | photon equivalent dose |
| Nominal sensitive volume | 1 l (32002) 10 l (32003) |
| Design | not waterproof, vented |
| Reference point | chamber center |
| Nominal response |
30 µC/Sv (32002) 300 µC/Sv (32003) |
| Chamber voltage | 400 V nominal ± 500 V maximal |
| Energy response |
< ± 4 % (32002)
< ± 3 % (32003) |
| Leakage current | ≤ ± 10 fA |
Materials and measures
| Wall of sensitive volume | 3 mm POM (polyoxymethylene) |
|---|---|
| Total wall area density |
470 mg/cm2 |
| Central electrode |
graphite coated polystyrene, diameter 50 mm (32002) diameter 100 mm (32003) |
| Outer dimensions |
diameter 140 mm (32002) |
Ion collection efficiency at nominal voltage
| Ion collection time | 37 ms (32002) 150 ms (32003) |
|---|---|
|
Max. dose rate for ≥ 99.5 % saturation ≥ 99.0 % saturation |
(32002); (32003) 210 mSv/h; 13 mSv/h 420 mSv/h; 26 mSv/h |
|
Max. dose per pulse for ≥ 99.5 % saturation ≥ 99.0 % saturation |
(32002); (32003) 1.6 µSv; 0.3 µSv |
Useful Ranges
| Chamber voltage | ± (300 … 500) V |
|---|---|
| Radiation quality | 25 keV … 1.3 MeV |
| Temperature | (10 … 40) °C (50 … 104) °F |
| Humidity | (10 … 80) %, max 20 g/m3 |
| Air pressure | (700 … 1060) hPa |
Options
T48010 Radioactive check device 90Sr
T48001 Chamber holding device for check device
Parts
TN32002 Spherical chamber 1 l, connecting system BNT
TW32002 Spherical chamber 1 l, connecting system TNC
TM32002 Spherical chamber 1 l, connecting system M
TN32003 Spherical chamber 10 l, connecting system BNT
TW32003 Spherical chamber 10 l, connecting system TNC
TM32003 Spherical chamber 10 l, connecting system M
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