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Chambers : Advanced Markus Chamber ®

Advanced Markus Chamber ®

Advanced Markus® Chamber, 0.02 cm3

Type 34045

The Advanced Markus chamber from PTW, developed in cooperation with Prof. Rosenow, Göttingen University, Germany, is the newest development of an electron chamber, combining advantages of both Roos® and Markus® chamber types. Since the outer shape is identical to the Markus® chamber, all existing Markus chamber phantom plates and adapters can be used with the Advanced Markus® chamber.

The small sensitive volume makes the chamber ideal for dose distribution measurements in a water phantom, giving a good spatial resolution. An improved design of the guard ring reduces the influence of scattered radiation from the housing and makes it possible to perform absolute electron dosimetry without perturbation effects. The chamber features a flat energy response within the nominal useful range from 4 MeV to 45 MeV. The membrane material is polyethylene of 0.03 mm thickness.

The Advanced Markus® Chamber comes with a protective acrylic cover of 0.87 mm thickness (1 mm water equivalence) for use in water. A calibration certificate with a Co-60 calibration factor given in absorbed dose to water is included. Air density correction is required for each measurement. A radioactive check device is available as an option. The chamber cable length is 1.05 meters.

Features:
  • Plane-parallel chamber for relative and absolute dosimetry of high-energy electrons in water and solid state phantoms
  • Vented sensitive volume of 0.02 cm3
  • Same dimensions as the Markus® chamber
  • Very thin entrance window
  • The chamber is waterproof when used with protective cap length is 1.05 m.

Advanced Markus Chamber Printable Information Sheet (.PDF format)