PD ISO/TS 23878:2024 PDF
Nanotechnologies. Positron annihilation lifetime measurement for nanopore evaluation in materials
Nanotechnologies. Positron annihilation lifetime measurement for nanopore evaluation in materials
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Дата публикации:
- 31 августа 2024 г.
- ICS:
- 07.120
- SKU:
- PD ISO/TS 23878:2024
Abstract
1 Scope This document describes a method for performing positron annihilation lifetime measurements using a 22 Na 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.
Похожие стандарты
Другие стандарты PD
PD 6605-2:1998
ОтменёнGuidance on methodology for assessment of stress-rupture data - Computing methods
PD ISO/TS 6226:2025
ДействующийHealth informatics. Reference architecture for syndromic surveillance systems for infectious diseases
1 Scope This document specifies a reference architecture for event-based syndromic surveillance systems for infectious diseases. The system reference architecture addresses architectural components i…
PD ISO/TS 17595:2025
ДействующийSolid biofuels. Characterization of wood chip fuels. Essential information for producers, suppliers and users
1 Scope This document provides guidance on the characterization of wood chips produced from raw materials, as defined in ISO 17225‑4 , for the following aspects: quality classes and specifications; s…
PD ISO/TS 4452:2025
ДействующийSpecification and demonstration of system reliability of single-use drug delivery systems
1 Scope This document addresses the specification and demonstration of capability and system reliability to successfully deliver a medicinal product as part of design verification and manufacture, ut…
PD ISO/TS 25271:2026
ДействующийAutomation systems and integration. Industrial digital twin interface architecture
1 Scope This document specifies the interface architecture of industrial digital twin systems, which is structured around three key elements: the digital twin, the physical twin and the interface tha…