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In 2011 a decision was made by Czech Metrology Institute to build a free-airionization chamber (FAC) intended to be used as a primary standard of air kermarate for medium-energy X-rays (photon energy from 40 to 300 keV, includingmammography X-ray qualities) in order to replace currently used secondaryionization chamber and to decrease the uncertainty of air kerma referencevalue. In period of 2013-2017, the FAC has been designed, manufactured and putinto operation. Correction factors were measured or calculated by a Monte Carlomethod. FAC performance was preliminary tested using a calibrated secondarychamber. Physical characteristics of the FAC are described and a summary of thecorrection factors with the uncertainty budget is presented.

Characterization of the new free-air primary standard for medium-energy X-rays at CMI