Features
- Sealed sensitive volume of 50 liters
- Suitable as stationary radiation monitoring chamber
- Gamma energy range 80 keV to 1.3 MeV
The ionization chamber T7262 has a constructive volume of 5 liters filled with Argon gas at the pressure of 10 bar, resulting in an effective sensitive volume of 50 liters. This superior design makes the chamber very sensitive and enables performing low level gamma radiation measurements down to the natural radiation background. The chamber is used as highly sensitive stationary surveillance device for environmental radiation monitoring. The chamber is fully guarded up to the sensitive volume. Since the sensitive volume is sealed, no air density correction is required. The cylindrical 50 liter chamber is made of steel with 3.25 mm wall thickness and a 3 mm aluminum cover. The ion-collecting electrode is made of brass. The external chamber diameter is 195 mm and the length is 538 mm. The chamber is supplied with two coaxial Fischer connectors for the transfer of the measuring signal and the polarizing voltage. Via an optional adapter cable of 1.5 m length, the chamber can be connected to a dosemeter with M connector, which has input circuits on ground potential. The maximal chamber polarizing voltage is 1000 V.
Specifications
| Type of product | pressurized cylindrical ionization chamber |
|---|---|
| Application | radiation monitoring |
| Measuring quantity | photon equivalent dose |
| Nominal sensitive volume | 50 l |
| Design | sealed and pressurized, filled with Ar (10 bar) |
| Reference point | chamber center |
| Direction of incidence | radial |
| Nominal response | 2 mC/Sv. |
| Chamber voltage | 1000 V nominal |
| Energy response |
≤ ± 10 % (Ephoton ≥ 80 keV) |
| Directional response in air | ≤ ± 10 % for tilting perpendicular to the axis up to ± 20° |
| Leakage current | ≤ ± 50 fA |
Materials and measures
| Wall of sensitive volume | 3 mm Al, 2.7 g/cm3 3.25 mm steel, 7.85 g/cm3 |
|---|---|
| Total wall area density | 3.361 g/cm2 |
| Dimension of sensitive volume |
radius 66.75 mm length 360 mm |
| Central electrode | brass, diameter 17.5 mm |
| Outer dimensions |
diameter 195 mm length 538 mm |
Ion collection efficiency at nominal voltage
| Ion collection time | 30 ms |
|---|---|
| Max. dose rate for ≥ 99 % saturation ≥ 90 % saturation |
1 mSv/h |
Useful Ranges
| Radiation quality | 80 keV … 1.3 MeV |
|---|---|
| Temperature |
(10 … 40) °C |
| Humidity | (10 … 80) %, max 20 g/m3 |
| Air pressure | (700 … 1060) hPa |
Options
T7262/U10-1.5 Connection cable with M connector, length 1.5 m
Parts
T7262 Radiation monitoring chamber 50 l, Fischer coax connectors
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