Development of micro pixel chamber

The novel gaseous detector “Micro Pixel Chamber (μ-PIC)” has been developed for X-ray, gamma-ray and charged particle imaging. The μ-PIC is made based on a double-sided printing circuit board, by which a large size detector could be produced easily. The operation tests were performed successfully using a 3 cm×3 cm μ-PIC with a 0.4 mm pitch. The gas gain and stability were measured in these tests. There is neither gain reduction nor discharge between anode and cathode at a gain of 103 for 5 days continuous operation. Also, no gain decrease was observed up to 107 cps(counts per second)/mm2 intense X-ray irradiation.