Method for manufacturing a cerium-doped lutetium oxyorthosilicate scintillator boule having a graded decay time
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United States of America Patent
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Jul 2, 2002
Grant Date -
Jul 19, 2001
app pub date -
Feb 28, 2001
filing date -
Apr 16, 1998
priority date (Note) -
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Abstract
A Cerium-Doped Lutetium Oxyorthosilicate scintillator boule having a graded decay time. The method for manufacturing an LSO:Ce crystal boule having a decay time gradient decreasing from the top end to the bottom end first includes the step selecting an iridium crucible. The crucible is selected based upon its diameter relative to the diameter defined by said crystal boule. The crucible is also selected based upon its volume relative to the volume of the crystal boule to be grown. A Cerium dopant (CeO.sub.2) is added to a mixture of Lutetium Oxide (Lu.sub.2 O.sub.3) and Silicon Dioxide (SiO.sub.2). The composition is heated until melted to define a melt. A seed crystal is then placed in contact with the melt, is rotated, and slowly withdrawn, thereby yielding an LSO:Ce crystal boule defining a decay time gradient.
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