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Charged particle beam irradiation apparatus

  • US 6,617,598 B1
  • Filed: 09/25/2002
  • Issued: 09/09/2003
  • Est. Priority Date: 02/28/2002
  • Status: Expired due to Term
First Claim
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1. A charged particle beam irradiation apparatus comprising:

  • a charged particle beam generation device including an accelerator; and

    an irradiation device for irradiating an irradiation target portion with a charged particle beam generated from the charged particle beam generation device;

    the irradiation device having a charged particle beam scanning device for scanning the charged particle beam and a Bragg peak enlarging device for increasing a width in a depth direction of a Bragg peak formed by the charged particle beam scanned by the charged particle beam scanning device, the Bragg peak enlarging device having a first filter member and a second filter member which are disposed in order in an advancing direction of the charged particle beam and each of which has at least one thick-walled portion in a direction intersecting the advancing direction, the first filter member and the second filter member being disposed with their respective thick-walled portions intersecting mutually in the advancing direction of the charged particle beam.

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