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ISO/TS 23878:2024

Nanotechnologies — Positron annihilation lifetime measurement for nanopore evaluation in materials

Aug 16, 2024

General information

60.60     Aug 16, 2024

ISO

ISO/TC 229

Technical Specification

07.120  

English  

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Scope

This document describes a method for performing positron annihilation lifetime measurements using a 22Na positron source that decays with β+ emission. The β+ (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:
— non-positronium forming materials;
— positronium-forming materials that induce a spin conversion reaction;
— positronium-forming materials that contain chemicals influencing the annihilation process of ortho-positronium by chemical reactions;
— positronium-forming materials that contain  mesoporous silica gels with a large contribution from the three-gamma annihilation process.

Life cycle

NOW

PUBLISHED
ISO/TS 23878:2024
60.60 Standard published
Aug 16, 2024