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PTW 23343, Markus Ion Chamber

PTW 23343, Markus Ion Chamber
PTW 23343, Markus Ion Chamber

Item Number :
300-625

PTW 23343, Markus® Ion Chamber.

Details

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PTW 23343, Markus® Ion Chamber.

The 23343 Markus chamber is manufactured in the original famous Markus design.  Absorbed dose to water can be measured by applying correction factors for perturbation effects as published in pertinent dosimetry protocols.  The thin entrance window allows measurements in solid state phantoms up to the surface.  The protection cap makes the chamber waterproof for measurements in water phantoms.

• Thin entrance window and waterproof protection cap

• Small-sized for high spatial resolution

• Sensitive volume 0.055 cm3, vented to air

Classic plane parallel chamber for absolute dosimetry in high-energy electron beams.

Specifications
Type of Product:  vented plane parallel ionization chamber
Application:  absolute dosimetry in high-energy electron beams
Measuring Quantities:  absorbed dose to water
Reference Radiation Quality:  60Co
Nominal Sensitive Volume:  0.055 cm3
Design:  Waterproof with protection cap, vented
Reference Point:  in chamber center on entrance foil, or 1.3 mm below surface of protection cap
Direction of Incidence:  perpendicular to chamber plane
Nominal Response:  2 nC/Gy
Long-term Stability:  ≤ 1% per year
Chamber Voltage:  300 V nominal ±400 V maximal
Polarity Effect:  ≤ 1% for electrons ≤ 9 MeV
Directional Response in Water:  ≤± 0.1% for chamber tilting ≤± 10°
Leakage Current:  ≤ ± 4 fA
Cable Leakage:  ≤ 3.5 pC/(Gy∙cm)

Materials and Measures: 
Entrance foil:  0.03 mm PE (polyethylene CH2), 2.76 mg/cm2
Protection cap:
  0.87 mm PMMA, 1.19 g/cm3, 0.4 mm air
Total window area density:  106 mg/cm2, 1.3 mm (protection cap included)
Water-equivalent window thickness:  1.06 mm (protection cap included)
Sensitive Volume:  radius 2.65 mm depth 2 mm
Guard ring width:
  < 0.2 mm

Ion Collection Efficiency at Nominal Voltage: 
Ion collection time:  90 µs

Max. dose rate for:
> 99.5 % saturation:
  12 Gy/s
> 99.0 % saturation:  24 Gy/s

Max. dose per pulse for:
> 99.5 % saturation:
  0.7 mGy
> 99.0 % saturation:  1.4 mGy

Useful ranges: 
Chamber voltage:  ±100 to 300 V
Radiation quality:  2 - 45 MeV electrons
Field size:  3 x 3 cm2 to 40 x 40 cm2
Temperature:  50° - 104° F (10° - 40°C)
Humidity:  10 - 80 %, max 20 g/m3
Air pressure:  700 - 1060 hPa

 

 Please specify which connection end is needed


Data Sheet

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