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AssigneeOsterreichisches Forschungszentrum Seibersdorf GmbH
InventorsJozsef Hizo, Klaus Duftschmid
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An ionization chamber for measuring an energy dose having a chamber wall with an electromagnetic radiation absorption characteristic equivalent to air, tissue or water and a neck part and being closed on all sides, an air compensation orifice; an outer electrode formed by a conductive coating on the inner surface of the chamber wall, an inner electrode and an electrically conductive ring surrounding the neck part of the chamber wall is disclosed. The chamber wall consists of at least 85% by weight of a base material containing polyacetal in a mixture with up to 20% by weight of polytetrafluoroethylene having additives consisting of one or more of calcium oxide, aluminum oxide, aluminum and carbon. The conductive coating on the inner surface of the chamber wall consists of a material containing one or more elements having an atomic number greater than 8.
An ionization chamber useful as a dosimetric secondary calibration standard having a chamber wall with a neck part and being closed on all sides, an air compensation orifice, an outer electrode formed by a conductive coating on the inner surface of the chamber wall, an inner electrode and an electrically conductive ring surrounding the neck part of the chamber wall, wherein:
An ionization chamber which can be used as a dosimetric secondary calibration standard, having a chamber wall closed on all sides, an air compensation orifice, a coating of a conductive material formed on the inner surface of a chamber wall as the outer electrode, an inner electrode and an electrically conductive protective ring surrounding the neck part of the chamber wall, wherein said chamber wall has a maximum thickness of 3 mm and has an electromagnetic radiation absorption characteristic equivalent to air, tissue or water and consists of at least 85% by weight of polyacetal and additives consisting of one or more of aluminum, aluminum oxide, calcium oxide and carbon, and the inner surface of said chamber wall is coated with an aluminum layer having a weight per unit area not greater than 0.05 g.
Dependencies are inferred from the claim text.