PTW radiation dosimetry

 

Diagnostic Radiology: Ionization Chambers
Flat Chambers
1 cm³, 112 cm³		   Type 77334, 77335
Flat Chambers 112 cm³ and 1 cm³  
The flat ion chambers 1 cm³ and 112 cm³ are suitable for precise dose measurements in the useful X-ray beam. The 1 cm³ chamber is calibrated from 25 kV to 35 kV and from 50 kV to 150 kV with filtering corresponding to a position behind or in front of a patient.

 
The 112 cm³ chamber is calibrated from 50 kV to 150 kV with patient-equivalent filtering. The maximum polarizing voltage for both chambers is 100 V. The area density of the 1 cm³ chamber is 7.1 mg/cm² and 24 mg/cm² of the 112 cm³ chamber. The chambers can be supplied by a BNT or TNC or PTW-M connector for operation in connection with a UNIDOS or UNIDOS E dosemeter. The NOMEX dosemeter requires an M connector. A radioactive check device is available to correct air density and carry out function tests.
 
Features:
  • The 1 cm³ chamber makes it possible to measure doses of mammography and dental X-ray devices as well as radiographic and fluoroscopic devices
  • The 112 cm³ chamber is designed for radiographic and fluoroscopic dose measurements behind a phantom (25 mm Al)

 

 
Flat Chamber 30 cm³   Type 233612
Flat Chamber 30 cm³  
The 30 cm³ flat chamber is especially designed for X-ray dose measurements in air down to
35 keV radiation energy. The maximum polarizing voltage is 500 V. The area density of the entrance window is 90 mg/cm² . The chamber can be supplied by a BNT or TNC or PTW-M connector. It can be operated in connection with a dosemeter UNIDOS or UNIDOS E.
A radioactive check device including check source and shielding is available to correct air density and carry out function tests. Using the appropriate holder, the check source can be positioned and oriented at the same place on the chamber.
Features:
  • Enables dose measurements of diagnostic X-ray qualities in air
  • Can be used down to 35 keV radiation energy
  • Comes with a holding stem for mounting in the radiation field
 
CT Chamber 3.14 cm³   Type 30009
CT Chamber 3.14 cm³  
The CT chamber type 30009 is part of the CTDI Set which makes CTDI and CTDIW determination possible acc. to IEC 61223-2-6 . The chamber can be inserted for measurements into one of five holes of the CT head or body phantom.


Open measuring volume, effective length 10 cm, 0.9 cm outer diameter.
Nominal useful range: 70 kV-150 kV.

 
Features:
  • Type tested by the German National Laboratory PTB
     
  • Part of the CTDI Set
  • Suitable for dose length product measurements according to IEC 61223-2-6
  • Uniform response over the chamber length

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CT Chamber 4.73 cm³   Type 77336
CT Chamber 4.73 cm³  
The long cylindrical 4.73 cm³ CT chamber is designed according to IEC 61223-2-6 for dose length product measurements of CT units. Its special construction ensures a uniform response over the chamber length. Open measuring volume, 15 cm long, 0.9 cm outer diameter. Nominal useful range: 30 kV-70 kV.
Features:
  • Type tested by the German National Laboratory PTB
  • Chamber according to IEC 61223-2-6 for measurements of the dose length product at computer tomography installations with diagnostic dosemeters
  • Uniform response over the chamber length

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