Electron beam conversion shield on the X-ray photon energy megavoltage range, in particular electrons from the medical accelerator

摘要

a conversion electron beam for photon radiation x in megawoltowym energy, especially of medical electron accelerator is designed in oncological radiotherapy irradiation to cancer patient tissue.is characterized by the fact that holds the vacuum (kp), in which is mounted symmetrically segmentowy beheaded cone made preferably with lead containing n ring segments (s1, s2, s3. sn) grouped together permanently. between the segments (s1, s2, s3. sn) truncated cone are horizontal outgassing channels (k1, k2, k3.kn), and in the inner space segmentowego truncated cone is spaced in horizontal planes, n - 1 of thin layers of foil preferably tungsten (f1, f2, f3... fn - 1), of a thickness of between 0,1 mm to 0.5 mm. in the upper wall of the vacuum chamber (kp) is a window input electrons (those), and in the lower exit window (10) x photon radiation.annular segments forming a truncated conical structure may be permanent magnets neodymowe favourably.