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.
| File Size : | 1
file
, 2.3 MB |
| ISBN(s) : | 9780539159509 |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 30 |
| Published : | 08/31/2024 |
