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Nanotechnologies - Positron annihilation lifetime measurement for nanopore evaluation in materials
This document describes a method for performing positron annihilation lifetime measurements using a 22Na positron source that decays with + emission.
The + (positron) lifetime is determined from a measurement of the lifetime of the ortho-positronium which ranges from 1 ns to 10 ns (ascribed to a pore size from approximately 0.3 nm to 1.3 nm in diameter), as observed for polymeric materials in which the positronium atoms mostly annihilate via a two-gamma annihilation process.
This document is not applicable to thin surface layers (that are less than several micrometers).
This document does not apply to measuring:
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