Title:
X-RAY GENERATOR USING HEMIMORPHIC CRYSTAL
Document Type and Number:
WIPO Patent Application WO/2006/103822
Kind Code:
A1
Abstract:
This invention provides an X-ray generator utilizing a high electric field which is generated upon heating or cooling of a hemimorphic crystal. Unidirectionally polarized lithium niobate crystal (1) and X-ray target (6) are disposed within a casing (8) kept in a vacuum state, and a thorium-containing tungsten wire (7) is disposed between the crystal (1) and the X-ray target (6). When the crystal is heated or cooled by a Peltier element (3), a high level of electric field is generated around the crystal. A thermoelectron released from the tungsten wire is accelerated by the electric field and collides against the X-ray target. The X-ray released at that time is radiated to the outside of the casing through a beryllium window (9). The X-ray generator can generate intense X-ray without using large equipment such as a high voltage power supply.
Inventors:
NAKANISHI YOSHIKAZU (JP)
ITO YOSHIAKI (JP)
YOSHIKADO SHINZO (JP)
NAKAMURA TORU (JP)
ITO YOSHIAKI (JP)
YOSHIKADO SHINZO (JP)
NAKAMURA TORU (JP)
Application Number:
PCT/JP2006/301322
Publication Date:
October 05, 2006
Filing Date:
January 27, 2006
Export Citation:
Assignee:
UNIV KYOTO (JP)
DOSHISHA (JP)
ASAHI ROENTGEN IND CO LTD (JP)
NAKANISHI YOSHIKAZU (JP)
ITO YOSHIAKI (JP)
YOSHIKADO SHINZO (JP)
NAKAMURA TORU (JP)
DOSHISHA (JP)
ASAHI ROENTGEN IND CO LTD (JP)
NAKANISHI YOSHIKAZU (JP)
ITO YOSHIAKI (JP)
YOSHIKADO SHINZO (JP)
NAKAMURA TORU (JP)
International Classes:
H01J35/14
Foreign References:
| US3840748A | 1974-10-08 | |||
| JP2005174556A | 2005-06-30 | |||
| JP2005285575A | 2005-10-13 |
Other References:
BROWNRIDGE J.D. ET AL.: "Investigations of pyroelectric generation of x rays", JOURNAL OF APPLIED PHYSICS, vol. 86, no. 1, 1 July 1999 (1999-07-01), pages 640 - 647, XP012047921
BROWNRIDGE J.D. ET AL.: "X-ray fluoresced high-Z (up to Z=82) K x-rays produced by LiNbO3 and LiTaO3 pyroelectric crystal electron accelerators", APPLIED PHYSICS LETTERS, vol. 85, no. 7, 16 August 2004 (2004-08-16), pages 1298 - 1300, XP001226673
BROWNRIDGE J.D. ET AL.: "X-ray fluoresced high-Z (up to Z=82) K x-rays produced by LiNbO3 and LiTaO3 pyroelectric crystal electron accelerators", APPLIED PHYSICS LETTERS, vol. 85, no. 7, 16 August 2004 (2004-08-16), pages 1298 - 1300, XP001226673
Attorney, Agent or Firm:
Takeishi, Yasuhiko (Chiyoda Seimei Kyoto Oike Bldg. 8F 200,
Takamiya-cho, Oike-dori Takakura Nishi-iru, Nakagyo-k, Kyoto-shi Kyoto, JP)
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