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Soft X-Ray Chamber 23342

Thin window plane-parallel chamber for dose measurements in superficial radiation therapy

  • Ultra thin entrance window
  • For low-energy photons from 15 kV to 70 kV
  • Sensitive volume 0.02 cm3, vented

The 23342 soft X-Ray chamber is the golden standard for reference dose measurements in low-energy photon beams as used in superficial radiation therapy.

Correction factors needed for the determination of absorbed dose to water are available.
The chamber is designed for the use in solid state phantoms.

Type of product vented plane-parallel ionization chamber acc. IEC 60731
Application reference 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)
Design not waterproof, vented
Direction of incidence perpendicular to chamber plane
Nominal sensitive volume 0.02 cm3
Nominal response 1 pC/Gy
Long-term stability ≤ 1 % per year
Chamber voltage 300 V nominal
  ± 500 V maximal
Reference point inner surface of the entrance window, at the center of the window
Leakage current ≤ ± 10 fA
Cable leakage ≤ 1 pC/(Gy·cm)

Materials and measures

Entrance foil 0.03 mm PE
Total window area density 2.76 mg/cm2
Sensitive volume radius 2.55 mm
  depth 1 mm
Electrode radius 1.5 mm

Ion collection efficiency at nominal voltage

Ion collection time 22 μs
Max. dose rate for  
≥ 99.5 % saturation 188 kGy/s
≥ 99.0 % saturation 375 kGy/s
Max. dose per pulse for  
≥ 99.5 % saturation 2.8 mGy
≥ 99.0 % saturation 5.6 mGy

Ranges of use

Chamber voltage ± (100 ... 400) V
Radiation quality (15 ... 70) kV X-rays
Field size (1 x 1) cm2 ... (40 x 40) cm2
Temperature (10 ... 40) °C
  (50 ... 104) °F
Humidity (20 ... 80) %, max 20 g/m3
Air pressure (700 ... 1060) hPa

Options

T48010 Radioactive check device 90Sr
T23238 Chamber holding device for check device
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