Model N34045

Advanced Markus®
Plane-Parallel Ion Chamber

The Model N34045 Advanced Markus® chamber is the latest development in electron chambers, with improved performance compared to the well-known Markus® chamber.  The chamber features a flat energy response within the nominal useful range from 2MeV to 45MeV.

The Model N34045's design is similar to the Markus® chamber, having the same external dimensions.  This allows it to fit into existing solid phantom cavities made for the Markus® chamber.  The internal dimensions are similar to the Markus®, with the exception of an improved guard ring design and 1mm electrode spacing.

The high degree of guarding greatly reduces the influence of scattered radiation from the housing and makes it possible to perform absolute electron dosimetry without perturbation effects.  The small sensitive volume makes the chamber ideal for dose distribution measurements in water phantoms, giving a good spatial resolution.  The entrance window material is polyethylene of 0.03mm thickness.

The Model N34045 comes with a protective acrylic cover, 0.87mm thick, for use in water.  The chamber is vented to the atmosphere, therefore density correction must be made for each measurement.  It is supplied with a 1m cable, choice of connectors and foam-padded case.

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