Title:
FLUORIDE SINGLE CRYSTAL, SCINTILLATOR, AND PRODUCTION METHOD FOR FLUORIDE SINGLE CRYSTAL
Document Type and Number:
WIPO Patent Application WO/2012/036239
Kind Code:
A1
Abstract:
[Problem] The purpose of the present invention is to provide a scintillator capable of detecting with high sensitivity hard X-ray, γ-ray, and other high energy photons. [Solution] A fluoride single crystal characterized by comprising a lutetium fluoride containing at least one type of element selected from Nd, Er, and Tm, and a scintillator characterized by comprising said fluoride single crystal are provided. The fluoride single crystal is obtained with a growth speed of vmax, indicated by the formula below, or less when: at least one element selected from Nd, Er, and Tm are added to a raw material mixture formed by mixing, for example, at least a lutetium fluoride and an alkali metal fluoride; the resultant mixture is melted to become a raw material melt; and the fluoride single crystal is grown from the raw material melt using the pulling up method. Vmax= α・R1/2/d1/3 (wherein α is 0.0062, R indicates the revolving speed (rpm) of the single crystal in relation to the raw material melt, and d indicates the average diameter (mm) of the single crystal.)
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Inventors:
ISHIZU SUMITO (JP)
FUKUDA KENTARO (JP)
KAWAGUCHI NORIAKI (JP)
NAGAMI TOMOHITO (JP)
YOSHIKAWA AKIRA (JP)
YANAGIDA TAKAYUKI (JP)
YOKOTA YUI (JP)
FUKUDA KENTARO (JP)
KAWAGUCHI NORIAKI (JP)
NAGAMI TOMOHITO (JP)
YOSHIKAWA AKIRA (JP)
YANAGIDA TAKAYUKI (JP)
YOKOTA YUI (JP)
Application Number:
PCT/JP2011/071113
Publication Date:
March 22, 2012
Filing Date:
September 15, 2011
Export Citation:
Assignee:
TOKUYAMA CORP (JP)
UNIV TOHOKU (JP)
ISHIZU SUMITO (JP)
FUKUDA KENTARO (JP)
KAWAGUCHI NORIAKI (JP)
NAGAMI TOMOHITO (JP)
YOSHIKAWA AKIRA (JP)
YANAGIDA TAKAYUKI (JP)
YOKOTA YUI (JP)
UNIV TOHOKU (JP)
ISHIZU SUMITO (JP)
FUKUDA KENTARO (JP)
KAWAGUCHI NORIAKI (JP)
NAGAMI TOMOHITO (JP)
YOSHIKAWA AKIRA (JP)
YANAGIDA TAKAYUKI (JP)
YOKOTA YUI (JP)
International Classes:
C30B29/12; C09K11/06; C09K11/85; C30B15/04; G01T1/202
Foreign References:
| JP2004137489A | 2004-05-13 |
Other References:
B. MOINE ET AL.: "Spectroscopic and scintillation properties of cerium-doped LuF3 single crystal", MATERIALS SCIENCE FORUM, vol. 239, no. 241, 1997, pages 245 - 248
J. MARTINCIK ET AL.: "VUV-UV-visible luminescence of Nd3+, Er3+ and Tm3+ in LiLuF4 single crystal host", RADIATION MEASUREMENTS, vol. 45, no. IS.3-6, March 2010 (2010-03-01), pages 403 - 405
A. YOSHIKAWA ET AL.: "Crystal growth and VUV luminescence properties of Er3+- and Tm3+-doped LiCaAlF6 for detectors", OPTICAL MATERIALS, vol. 32, no. 9, July 2010 (2010-07-01), pages 845 - 849
K. FUKUDA ET AL.: "Crystal growth and scintillation characteristics of the Nd3+ doped LaF3 single crystal", OPTICAL MATERIALS, vol. 32, 22 April 2010 (2010-04-22), pages 1142 - 1145
J. MARTINCIK ET AL.: "VUV-UV-visible luminescence of Nd3+, Er3+ and Tm3+ in LiLuF4 single crystal host", RADIATION MEASUREMENTS, vol. 45, no. IS.3-6, March 2010 (2010-03-01), pages 403 - 405
A. YOSHIKAWA ET AL.: "Crystal growth and VUV luminescence properties of Er3+- and Tm3+-doped LiCaAlF6 for detectors", OPTICAL MATERIALS, vol. 32, no. 9, July 2010 (2010-07-01), pages 845 - 849
K. FUKUDA ET AL.: "Crystal growth and scintillation characteristics of the Nd3+ doped LaF3 single crystal", OPTICAL MATERIALS, vol. 32, 22 April 2010 (2010-04-22), pages 1142 - 1145
Attorney, Agent or Firm:
Patent Profession Corporation Odajima Patent Office (JP)
Patent business corporation Odajima patent firm (JP)
Patent business corporation Odajima patent firm (JP)
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