Secondary-standard ionization chamber, in particular for measuri

Details Secondary-standard ionization chamber, in particular for measuri Secondary-standard ionization chamber, in particular for measuri

1980-03-10

1981-11-10

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250252, H01J 3928, G01D 1800

Patent

active

043000509

ABSTRACT:
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.

REFERENCES:
patent: 2536991 (1951-01-01), Wollan et al.
patent: 2683234 (1954-07-01), Lynch
patent: 3898464 (1975-08-01), Stephan

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