Patent ID: 7683340

Claim:
A radiation counting detector comprising: a first substrate; a second substrate generally parallel to said first substrate and forming a gap with said first substrate; a gas contained within said gap; a photocathode layer coupled to said first substrate and facing said second substrate; at least one first electrode coupled to said second substrate; at least one second electrode electrically coupled to said first electrode; a first impedance coupled to said first electrode; a second impedance coupled to said second electrode; a power supply coupled to at least one of said electrodes; a first discharge event detector coupled to said first impedance; a second discharge event detector coupled to said second impedance; a plurality of pixels, each pixel capable of outputting a gas discharge pulse upon interaction with radiation received from said photocathode, wherein each gas discharge pulse is counted as having an approximately equal value; and circuitry for detecting if a gas discharge pulse is output from the pixels, and for counting each gas discharge pulse as an individual event; wherein an amount of detected radiation is based on how many gas discharge pulses are output from the pixels.