Owens Scientific -- Advanced Markus Chamber

Small Business / Woman Owned, HUB Certified - State of Texas

23230 Sandsage Lane
Katy, Texas 77494-4207
Phone: (281) 394-2311
Fax: (281) 394-2522

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Radiation Therapy : Advanced Markus Chamber

The Advanced Markus chamber, 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 m. *Features (also see Markus chamber):* Plane-parallel chamber for relative and absolute dosimetry of high-energy electrons in water and solid state phantoms Vented sensitive volume of 0.02 cmł Same dimensions as the Markus chamber Very thin entrance window The chamber is waterproof when used with protective cap

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