PTW 23344 0.2cc Soft X-Ray Chamber

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PTW 23344 0.2cc Soft X-Ray Chamber.

The 23344 soft X-ray chamber is used for absolute dose measurements in low-energy photon beams as used superficial radiation therapy.  The sensitive volume is larger than that of the 23342 chamber, giving a higher signal at the cost of a lower spatial resolution.  Correction factors needed for the determination of absorbed dose to water are available.  The chamber is designed for the use in solid state phantoms.

Features

• 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.

Specifications
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:  0.2 cm³
Design:  not waterproof, vented
Reference Point:  in chamber center of entrance foil underside
Direction of Incidence:  perpendicular to chamber plane
Nominal Response:  7 nC/Gy
Long-term Stability:  ≤ 1% per year
Chamber Bias Voltage:  400 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 mmPE
Total window area density:  2.76 mg/cm²
Sensitive Volume:  radius 6.5 mm, depth 1.5 mm

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

Max. dose rate for:
≤ 99.5% Saturation:  60 Gy/s
≤ 99.0% Saturation:  120 Gy/s

Max. dose per pulse for:
≤ 99.5% Saturation:  1.1 Gy
≤ 99.0% Saturation:  2.7 Gy

Useful ranges: 
Chamber Voltage:  ± 100 – 400 V
Radiation quality:  8 - 35 keV x-rays
Field Size:  2 x 2 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