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PTW 23342 0.02cc Soft X-Ray Chamber

PTW 23342 0.02cc Soft X-Ray Chamber
PTW 23342 0.02cc Soft X-Ray Chamber

Item Number :

PTW 23342 0.02cc Soft X-Ray Chamber.


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PTW 23342 0.02cc Soft X-Ray Chamber.

The 23342 soft X-ray chamber is the golden standard for absolute 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.


• Ultra thin entrance window

• For low-energy photons from 8 keV to 35 keV

• Suitable for use in air and in solid state phantoms

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

Type of Product:  vented plane parallel ionization chamber
Application:  absolute 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)
Nominal Sensitive Volume:  0.02 cm3
Design:  not waterproof, vented
Reference Point:  in chamber center of entrance foil underside
Direction of Incidence:  perpendicular to chamber plane
Nominal Response:  1 nC/Gy
Long-term Stability:  ≤ 1% per year
Chamber Bias Voltage:  300 V nominal, ± 500 V Maximal
Directional Response:  ≤ ± 1% for chamber tilting up to ± 20°
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 1.5 mm, depth 1 mm

Ion Collection Efficiency at Nominal Voltage:
Ion Collection Time:
  30 µs

Max. dose rate for:
≤ 99.5% Saturation:
  175 Gy/s
≤ 99.0% Saturation:  350 Gy/s

Max. dose per pulse for:
≤ 99.5% Saturation:
  1.8 Gy
≤ 99.0% Saturation:  4.5 Gy

Useful ranges: 
Chamber Voltage:  ± 100 – 400 V
Radiation quality:  8 - 35 keV x-rays
Field Size:  1 x 1 cm2 to 40 x 40 cm2
Temperature:  50° - 104° F (10° - 40°C)
Humidity:  20 - 80 %, max 20 g/m3
Air Pressure:  700 – 160 hPa


 Please specify which connection end is needed

Data Sheet