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Semiflex Ionization Chamber 31010

Standard therapy chamber for scanning systems and for reference dosimetry

  • Waterproof, semiflexible design for easy mounting in scanning water phantoms
  • Minimized directional response
  • Sensitive volume of 0.125 cm3, vented
  • Point dose patient QA with RUBY

The 31010 semiflexible chamber is the ideal compromise between small size for reasonable spatial resolution and large sensitive volume for precise dose measurements.
This makes the 31010 chamber to one of the most commonly used chambers in scanning water phantom systems.

The chamber volume of 0.125 cm3 gives enough signal to use the chamber also for high precision reference dose measurements.

The sensitive volume is approximately spherical resulting in a flat angular response and a uniform spatial resolution along all three axes of a water phantom.

Type of product vented cylindrical ionization chamber
Application reference dosimetry in radiotherapy beams
Measuring quantities absorbed dose to water, air kerma, exposure
Reference radiation quality 60Co
Design waterproof, vented, guarded
Direction of incidence radial
Nominal sensitive volume 0.125 cm3
Nominal response 3.3 nC/Gy
Long-term stability ≤ 1 % per year
Chamber voltage 400 V nominal, ± 500 V maximal
Polarity effect at 60Co < 2 %
Reference point on chamber axis, 4.5 mm from detector tip
Photon energy response ≤ ± 2 % (140 kV ... 280 kV)
  ≤ ± 4 % (200 kV ... 60Co)
  ≤ ± 5 % (50 kV ... 150 kV)
Directional response in water ≤ ± 0.5 % for rotation around the chamber axis and for tilting of the axis up to ± 10°
Leakage current ≤ ± 4 fA
Cable leakage ≤ 1 pC/(Gy·cm)

Materials and measures

Wall of sensitive volume 0.55 mm PMMA, 1.19 g/cm3
  0.15 mm graphite, 0.82 g/cm3
Total wall area density 78 mg/cm2
Dimensions of sensitive volume radius 2.75 mm
  length 6.5 mm
Central electrode Al 99.98, diameter 1.1 mm
Build-up cap PMMA, thickness 3 mm

Ion collection efficiency at nominal voltage

Ion collection time 121 μs
Max. dose rate for  
≥ 99.5 % saturation 6 Gy/s
≥ 99.0 % saturation 112 Gy/s
Max. dose per pulse for  
≥ 99.5 % saturation 0.5 mGy
≥ 99.0 % saturation 1.0 mGy

Ranges of use

Chamber voltage ± (100 ... 400) V
Radiation quality 140 kV ... 50 MV photons
  (10 ... 45) MeV electrons
  (50 ... 270) MeV protons
Field size (3 x 3) cm2 ... (40 x 40) cm2
Temperature (10 ... 40) °C
  (50 ... 104) °F
Humidity (10 ... 80) %, max 20 g/m3
Air pressure (700 ... 1060) hPa

Options

T48012 Radioactive check device 90Sr
T48002.1.004 Chamber holding device for check device
T40072.1.160 RUBY detector holder T31010

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