Medical X-ray tube

X-ray tube test data are shown in this paper and proposals of cerametallic X-ray tube properties improving are made. Particularly, advantages of using monocrystalline anode and monocrystalline flat emitter are presented. During first 1000 cycles dosage rate of X-ray tube with monocrystalline anode reducing for (10+12)%. Then dose reducing rate become stable near (0,7+1,0)% per 1000 cycles. X-ray tube with polyocrystalline anode has more significant reducing during first 4000 cycles. Modern mammography X-ray tubes require small electron focal spot. Traditional coil emitter made of tungsten filament dont satisfy this requirements. Thus most perspective emitter for mammography X-ray tubes is emitter with plane emitting surface. In addition tungsten emitter with single-crystal structure has less working temperature due to its smaller work function ([111] crystallographic plane of tungsten has work function about 4,4 eV, while polycrystalline tungsten - 4,55 eV). Working temperature difference of this materials is about 70 degrees C.