5. Conclusions
The theoretical basis for positron annihilation in defects is best understood in metallic, covalent or ionic crystals, where it provides immediate access to defect free volume, whether the solid is single or polycrystalline. However, it can also be used to track free volume variations in molecular crystals or amorphous solids
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Installation costs
In terms of budget, the electronic part of the three classic techniques costs around e30,000 (in 2000) each. More sophisticated set-ups can obviously increase this price. To the price of the electronics and sources, we must of course add the cost of the cryogenic facilities and the mechanical parts of the apparatus (angular correlation). Finally, a complete bibliography can be found in the works cited in the references...
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