The 0.02 cc Advanced Markus Chamber 30 331 is our newest development in plane-parallel electron ion chambers. This chamber combines the advantages of both Roos™ and Markus chamber types into one truly exceptional plane-parallel electron chamber. Developed for relative and absolute electron dosimetry in water or solid type phantoms, the advanced design of this chamber makes it possible to perform absolute electron dosimetry without perturbation effects. This chamber is designed in strict accordance with the recommendations of IEC 60731 and it is waterproof. Since the outer shape is identical to that of the Markus chamber, all existing Markus chamber phantom plates and adapters can be used with the Advanced Markus chamber. The small sensitive volume makes this 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 2 to 45 MeV. The membrane material is polyethylene of 0.03 mm thickness. The Advanced Markus chamber comes with a protective acrylic cover 0.87 mm thick (1 mm water equivalence) for use in water. In addition, the chamber includes a 3.4 ft (1.05 m) cable and BNC Triax connector. Air density correction is required for each measurement. A radioactive check device is available as an option.
Features
Vented sensitive volume of 0.02 cm3
Same dimensions as the Markus chamber
Suitable for relative and absolute electron dosimetry
Very thin entrance window
The chamber is waterproof when used with protective cap
