Combined different valence ions doped crystal of lead tungstate with high light yield, and prepartion method

An ion doping, lead tungstate technology, applied in crystal growth, chemical instruments and methods, single crystal growth, etc., can solve the problems of low light yield, slow luminescence, insignificant increase in light yield, etc. The effect of high volume, high yield, and low proportion of slow-emitting components
CN101092746AInactive Publication Date: 2007-12-26SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
Publication Date
2007-12-26
Estimated Expiration
Not applicable · inactive patent

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Abstract

This invention relates to a method for preparing heterovalent ions-doped high-luminescence-yield lead tungstate crystal and its preparation method. The high-luminescence-yield lead tungstate crystal is doped with F- 100-8000 ppm, Sb3+ 100-5000 ppm, and Mo6+, V5+, Nb5+, Zr4+, and Ti4+ 0-10000 ppm, and is prepared via modified Bridgman method by using platinum crucible. The method can be used for preparing several strands of lead tungstate crystals in one process, and is suitable for mass production. The obtained heterovalent ions-doped high-luminescence-yield lead tungstate crystal has such advantages as rapid attenuation and high luminescence yield.
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Description

technical field

[0001] The invention relates to a heterovalent ion synergistically doped high-light-yield lead tungstate crystal and a preparation method thereof, belonging to the field of crystal growth. Background technique

[0002] Since the 1990s, the rapid development of nuclear medicine imaging technology (such as X-CT: X-ray computed tomography, SPET-single photon emission computed tomography, PET-positron electron tomography) has greatly promoted the scintillation crystal and inspire people to explore medical scintillation crystals with excellent performance. The main requirements of medical scintillation crystals are: high density, high luminous efficiency, short decay length and decay time. Among them, bismuth germanate (BGO) crystal is the most widely used in PET at present, but its decay time is too long (greater than 300ns), which is not conducive to the improvement of image resolution; while lutetium silicate (LSO) crystal has a short Decay time (40ns) and hi...

Claims

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