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PTW 31015, 0.03 cc PinPoint Chamber

PTW 31015, 0.03 cc PinPoint Chamber
PTW 31015, 0.03 cc PinPoint Chamber

Item Number :
300-673

PTW 31015, 0.03 cc PinPoint® Chamber

Details

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PTW 31015, 0.03 cc PinPoint® Chamber

The PinPoint chambers are ideal for dose measurements in small fields as encountered e.g. in IORT, IMRT and stereotactic beams.  Relative dose distributions can be measured with very high spatial resolution when the chambers are moved perpendicular to the chamber axis.  The waterproof, fully guarded chambers can be used in air, solid state phantoms and in water.

• Small-sized cylindrical ion chambers with vented sensitive volumes of only 0.015 cm³ / 0.03 cm³ and 2 mm / 2.9 mm in diameter

• Ideal for dose measurements in small fields as e.g. in IORT, IMRT and stereotactic beams

• Very high spatial resolution when used for scans perpendicular to the chamber axis

• Suitable for field sizes from 2 cm x 2 cm to 30 cm x 30 cm

• Aluminum central electrode.

Ultra small-sized therapy chambers for dosimetry in high-energy photon beams.

Specifications
Type of Product:  vented cylindrical ionization chamber
Application:  dosimetry in high-energy photon beams with high spatial resolution
Measuring Quantities:  absorbed dose to water, air kerma, exposure
Reference Radiation Quality:  60Co
Nominal Sensitive Volume:  0.03 cm3
Design:  Waterproof, vented fully guarded
Reference Point:  on chamber axis, 3.4 mm from chamber tip
Direction of Incidence:  radial
Pre-irradiation Dose:  2Gy
Nominal Response:  800 pC/Gy
Long-term Stability:  ≤ 1% per year
Chamber Voltage:  400 V nominal ±500 V maximal
Polarity Effect at 60Co:  ≤± 2%
Directional Response in Water:  ≤± 0.5% for rotation around the chamber axis, ≤± 1% tilting of the axis up to ± 20° (radial incidence)
Leakage Current:  ≤ ± 4 fA
Cable Leakage:  ≤ 1 pC/(Gy∙cm)

Materials and Measures: 
Wall of Sensitive Volume:  0.57 mm PMMA 1.19 g/cm3, 0.09 mm graphite 1.85 g/cm3

Total Wall Area Density:  85 mg/cm2
Dimension of Sensitive Volume:  radius 1.45 mm, length 5 mm
Central Electrode:  Al 99.98, diameter 0.3 mm
Build-up Cap:  PMMA, thickness 3 mm

Ion Collection Efficiency at Nominal Voltage: 
Ion collection time:  50 µs

Max. dose rate for:
> 99.5 % saturation:
  29 Gy/s
> 99.0 % saturation:  55 Gy/s

Max. dose per pulse for:
> 99.5 % saturation:
  1.2 mGy
> 99.0 % saturation:  2.3 mGy

Useful ranges: 
Chamber voltage:  ±100 to 400 V
Radiation quality:  60Co - 50 MV photons
Field size:  2 x 2 cm2 to 30 x 30 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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