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PTW 30013 Waterproof Farmer Chamber

PTW 30013 Waterproof Farmer Chamber
PTW 30013 Waterproof Farmer Chamber

Item Number :
300-655

PTW 30013 Waterproof Farmer® Chamber, MOST POPULAR.

Details

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PTW 30013 Waterproof Farmer® Chamber, MOST POPULAR.

The 30013 has a nominal photon energy range from 30 kV to 50 MV, the electron energy range is from 10 MeV to 45 MeV.  This chamber type is of rugged construction, since the wall material is graphite with a protective acrylic cover and the electrode is made of aluminum.  The guard ring is designed up to the measuring volume.  A calibration certificate for calibration in absorbed dose to water or air kerma is included with each chamber.  Air density correction is required for each measurement

• Waterproof, fully guarded chamber

• Vented sensitive volumes of 0.6 cm3

• Suitable as therapy chamber for use in water

• Flat energy response

• Correction factors needed to determine absorbed dose to water or air kerma are published in the pertinent dosimetry protocols.

• The chamber is waterproof and can be used in water or solid state phantoms


Waterproof therapy chamber for absolute dosimetry in high-energy photon, electron and proton beams.

Specifications
Type of Product:  vented cylindrical ionization chamber acc. IEC 60731
Application:  absolute therapy dosimetry in water, solid state phantoms and air
Measuring Quantities:  absorbed dose to water, air kerma, exposure
Reference Radiation Quality:  60Co
Nominal Sensitive Volume:  0.6 cm3
Design:  Waterproof, vented fully guarded
Reference Point:  on chamber axis, 13mm from tip
Direction of Incidence:  radial
Nominal Response:  20 nC/Gy
Long-term Stability:  ≤0.5 % per year
Chamber Voltage:  400 V nominal ±500 V maximal
Polarity Effect at 60Co:  < 0.5%
Photon Energy Response:  ≤ ± 2% (70 kV to 280 kV),  ≤ ± 4% (200 kV to 60Co)
Directional Response in Water:  ≤± 0.5 % for rotation around the chamber axis and for tilting of the axis up to ± 5°
Leakage Current:  ≤ ± 4 fA
Cable Leakage:  ≤ 1 pC/(Gy∙cm)
Materials and Measures:  0.335 mm PMMA,  0.09 mm graphite
Wall of Sensitive Volume:
  1.19 g/cm3,  1.85 g/cm3

Total Wall Area Density:  56.5 mg/cm2
Dimension of Sensitive Volume:  radius 3.05 mm, length 23.0 mm
Central Electrode:  Al 99.98, diameter 1.1 mm
Build-up Cap:  PMMA, thickness 4.55 mm

Ion Collection Efficiency at Nominal Voltage: 
Ion collection time:  140 µs

Max. dose rate for:
> 99.5 % saturation:
  5 Gy/s
> 99.0 % saturation:  10 Gy/s

Max. dose per pulse for:
> 99.5 % saturation:
  0.46 mGy
> 99.0 % saturation:  0.91 mGy

Useful ranges: 
Chamber voltage:  ±100 to 400 V
Radiation quality:
  30 kV to 50 MV photons (10 to 45) MeV electrons (50 to 270) MeV protons
Field size:
  (5 x 5) 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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