Abstract: The present invention provides a radiation detector in which primary electrons are released into a gas by ionizing radiation from a radiation source (10) and are caused to drift to read-out electrodes (1) by means of an electric field (2) generated by applying a negative tension to a drifting electrode (11) located near the radiation source (10), characterized in that it comprises three sets of longitudinal electrodes (1) forming three superposed planes which are substantially perpendicular to said electric field (2), the longitudinal electrodes (1) in the respective planes being applied progressively positive tensions relatively to the drifting electrode (11) when going from the plane (4) closest to the drifting electrode to the plane (4?) farthest from the drifting electrode, said plane (4?) farthest from the drifting electrode being applied a positive tension.

Abstract: This disclosure relates to improved piezoelectric quartz crystal products preferably used in quartz crystal filter and resonator applications, and fabrication methods therefor. Various embodiments are disclosed including a substantially circular, a square, and a rectangular quartz crystal product wherein each one contains a single triangular shaped electrode located on each of the two sides thereof in an overlapping arrangement. Other embodiments disclosed include a substantially circular, a square, and a rectangular quartz crystal product wherein each one contains multiple electrodes such as two spaced apart triangular shaped electrodes located on each side of the two sides thereof in an overlapping arrangement.