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Scintillators for positron emission tomographs

#A-1165


Research and Development of LuAP Scintillation Crystals for New Generation Positron Emission Tomographs (PET)

Tech Area / Field

  • MAN-MAT/Engineering Materials/Manufacturing Technology
  • MAT-SYN/Materials Synthesis and Processing/Materials

Status
8 Project completed

Registration date
19.07.2004

Completion date
01.10.2008

Senior Project Manager
Tyurin I A

Leading Institute
Institute for Physical Research, Armenia, Ashtarak-2

Collaborators

  • CERN / European Laboratory for Particle Physics, Switzerland, Geneva\nCNRS/Université de Claude Bernard-Lyon 1 / Laboratoire de Physico-Chimie des Materiaux Luminescents, France, Lyon

Project summary

The main objective of the Project is refinement of the growth procedures in order to develop LuAP single crystals of improved optical quality and scintillation performance. Application of such crystals in medical imaging will significantly improve spatial resolution and sensitivity of the scanners, and decrease the patient dose. This objective will be achieved in the course of performance of the following tasks:
- refinement of the Bridgman process for growth of large and perfect LuAP single crystals,
- increase the volume of crystallized material per run for better productivity,
- compositional modifications and search for new compounds,
- growth of experimental series of crystals for scintillation tests and application in prototype PET units,
- adjustment and modernization of the crystal growth facilities and of supporting infrastructure,
- information analysis
The project assumes that over one hundred large LuAP crystals will be grown. They will differ in growth history (crystallization rate, atmosphere, pressure) and size. The crystals will be characterized in terms of optical and scintillation properties and used for fabrication of scintillation pixels. It is expected that by the end of the first year of project performance, the experimental samples will satisfy the following technical parameters:
- LuAP in sizes 15-20 mm in diameter, 100 mm long,
- Ce concentration: 0.3-0.5 at. %
- finished element dimensions: 2x2x10 mm3 and 2x2x8 mm3,
- optical transmission (%) at 365 nm: 75-80 % (without account for Fresnel losses),
- absorption coefficient at 260 nm: less than 8 cm-1,
- light yield (2x2x8 mm3): reliably 40% of LSO (figures up to 50% may be expected); deviation of the light yield in series not more than 20%,
- energy resolution: 10 %,
- % of the slow component: less than 10%.

The project will be performed in close collaboration with Laboratoire de Physico-Chimie des Materiaux Luminescents, UMR 5620 CNRS & Universitй Lyon I in the frame of activities of the Crystal Clear Collaboration at CERN.


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