Varian Associates, Inc.

Willi Fencl

Derek J Day

Heinrich Riem

Reza Majidi-Ahy

Salvatore Provencale

Salvatore Provenzale

Rolf Staehelin

Rolf Stahelin

The present invention provides electrode assemblies for LIC imagers that maximize ion collection and the electric field for the minimum bias voltage. To achieve this optimization the ion collection is confined to small regions. Due to this limited ion collection region, high neutralization efficiencies and fast sweep-out times can be obtained. Furthermore, with an electrode separation of approximately 0.1 millimeters, pulse voltages of less than 100 volts can be used. Low voltages result in improved reliability, longer system life, and lower safety risks.

Liquid ion chamber electrode apparatus

A three terminal ionization chamber includes a first electrode coupled to a bias voltage source spaced apart from a second electrode coupled to ground. A third terminal is provided which is positioned between the first and second electrodes. Measurement circuitry may be coupled to the third terminal to measure charge indicative of the amount of radiation incident to the chamber.

Three terminal ion chambers

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Zurich, Switzerland

Willi Fencl