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    • 4. 发明授权
    • Enhanced electron backscattering in x-ray tubes
    • x射线管增强电子反向散射
    • US07260181B2
    • 2007-08-21
    • US10558767
    • 2004-05-12
    • James L. McDonaldAllan D. Kautz
    • James L. McDonaldAllan D. Kautz
    • H01J35/18
    • H01J35/10H01J35/18H01J2235/122H01J2235/168H01J2235/183
    • An x-ray tube (24) includes an anode (42) defining a target. A cathode assembly (40) is in operative relationship with the anode to produce x-rays (56). An evacuated envelope (35) encloses the anode and cathode. The evacuated envelope includes a metal frame portion (39). The material comprising the metal frame portion has a backscatter coefficient. An x-ray transmissive window (41) is joined in a vacuum tight manner to the metal frame portion of the evacuated envelope. The material comprising the x-ray transmissive window has a backscatter coefficient. A backscatter layer (90) is deposited on the x-ray transmissive window and the metal frame portion of the evacuated envelope around the x-ray transmissive window. The backscatter layer has a backscatter coefficient greater than the backscatter coefficient of both of the window and the metal frame.
    • X射线管(24)包括限定靶的阳极(42)。 阴极组件(40)与阳极处于操作关系以产生x射线(56)。 真空的外壳(35)包围阳极和阴极。 真空外壳包括金属框架部分(39)。 包括金属框架部分的材料具有反向散射系数。 x射线透射窗(41)以真空密封方式连接到真空外壳的金属框架部分。 包括x射线透射窗的材料具有反向散射系数。 反射散射层(90)沉积在X射线透射窗和真空外壳的围绕x射线透射窗的金属框架部分。 后向散射层的后向散射系数大于窗口和金属框架的反向散射系数。