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New High Light Scintillators

#1683


Development of New Scintillators with High Light Yield for Use in Nuclear Physics and Medicine

Tech Area / Field

  • CHE-SYN/Basic and Synthetic Chemistry/Chemistry
  • PHY-SSP/Solid State Physics/Physics

Status
3 Approved without Funding

Registration date
19.10.1999

Leading Institute
VNIIKhT (Chemical Technology), Russia, Moscow

Supporting institutes

  • FIAN Lebedev, Russia, Moscow

Collaborators

  • Universität Erlangen-Nürnberg / Physikalisches Institut, Germany, Erlangen\nRoyal Institute of Technology,Physics Department Frescati, Sweden, Stockholm\nStoller Ingenieurtechnik GmbH, Germany, Dresden

Project summary

The aim of the Project is the development of synthesis and study of scintillating crystals having high light yield, short decay time, high radiation hardness, high density and good mechanical properties and with acceptable cost.
To solve these problems studies of luminescence process nature, mechanisms of energy transfer on scintillating centers and luminescence suppression for new inorganic crystals is foreseen. On the basis of obtained data the main factors, defining modification of scintillating properties of scintillators depending on their structure, conditions of growth and annealing of crystals will be investigated. The technology of crystal synthesis, developed as a result of these studies, will improve the quality of produced scintillators. This technology will be used for production both well-known crystals (like LSO and LuAP) and new scintillating crystals of various structure, doped by Се3+ (such as mixed garnets Y3 Al5 O12, Gd3Al5O12, Lu3Al5O12, perovskites GdAlO3, LuAlO3, YAlO3, silicates Lu2SiOs, Y2SiOs, Gd2SiO5). On the basis of new scintillators, the most promising materials for application in nuclear physics, medicine, radioactive monitoring as well as prototypes of detectors will be developed and produced.


Main directions of studies:

• Study of synthesis processes of refractory high-density oxides based on Lu, Gd, and Y.
• Study of scintillating properties of synthesized crystals depending on technological parameters and purity of initial materials;
• Development of scintillating detectors on the basis of oxide scintillators.

It is expected that new scintillating oxide crystals will have the following properties:


Density - 7-9g/cm3


Light Yield - 60-70 % of NaI (Tl)

Decay time - less-than 40 ns

Hygroscopicity - none


Samples satisfying the requirements of practical application in nuclear physics, medicine (positron emission tomography), experiments on synchrotron radiation, monitoring of radioactive contamination etc. will be developed. On this basis prototypes of detectors using new scintillating crystals will be developed and produced.
The work is finished by analysis of tests of the developed detectors by the collaborators and issue of recommendations on application and commercial production of scintillators.
The commercial part of the Project consists in development and production of new scintillating materials with properties ensuring their broad application in a science, engineering, medicine and ecology.
Highly qualified experts in the field of chemistry, technology and physics, engaged in the nuclear weapons production, and scientists of the Russian Academy of Sciences, working earlier on problems of the Project, will be involved in the Project.


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