X-ray detector array

An ion chamber detector array for determining the distribution of x-ray intensities in one or more flat, coplanar, x-ray beams comprising:

• a first flat anode sheet disposed in a plane lying parallel to the plane of said x-ray beams;
• a second, flat anode sheet disposed parallel to said first anode sheet,
• a third, flat anode sheet disposed parallel to and adjacent a side of said first anode sheet opposite said second anode sheet;
• a first plurality of rod-like cathode elements disposed in said x-ray beam and equi-distant between said first anode sheet and said second anode sheet, a long dimension of said cathode elements being oriented in a direction substantially parallel to the angle of incidence of one or more of said x-ray beams;
• a second plurality of rod-like cathode elements disposed in said x-ray beam and equi-distant between said first anode sheet and said third anode sheet, a long dimension of said cathode elements being oriented in a direction substantially parallel to the angle of incidence of one or more of said x-ray beams;
• a gaseous detecting medium disposed between said first anode sheet, and second anode sheet, said third anode sheet, and said cathodes;
• means for applying an electric potential between said cathodes and said anodes, whereby an electric field is impressed between said cathodes and said anodes, and for connecting each of said cathodes to a signal processing circuit.