SIST EN ISO 18589-4:2021 PDF

Overview

EN ISO 18589-4:2021 (ISO 18589-4:2019) specifies a laboratory test method for measuring plutonium isotopes (238Pu and 239+240Pu) in soil using alpha spectrometry combined with chemical separation techniques. Adopted by CEN as a European Standard, this document is part of the ISO 18589 series on measurement of radioactivity in the environment and supports reliable, comparable environmental radioactivity data for monitoring and radiological protection.

Key topics and technical requirements

• Scope and applicability: Method covers soil and, with correct sampling, can be applied to sludge, sediment, construction materials and products.
• Analytical principle: Describes chemical desorption and separation of plutonium followed by preparation of an alpha-emitting source and measurement by alpha spectrometry.
• Source preparation options: Includes electro-deposition and co‑precipitation preparation routes (detailed in annexes).
• Sample mass: Test portion mass depends on expected activity and detection limit; practical range 0.1 g to 100 g.
• Low-level detection: Procedures enable measurement at activities one to two orders of magnitude below natural alpha-emitting radionuclide levels.
• Quality aspects: Guidance on background determination, measurement, expression of results, calculation of activity per unit mass, standard uncertainty, decision threshold, detection limit and confidence limits.
• Supporting material: Informative annexes provide detailed procedures for desorption, solvent extraction, anion-exchange and specific resin separations, and source preparation.

Practical applications and users

This standard is intended for laboratories and organizations involved in:

• Environmental monitoring and routine soil surveillance around nuclear sites and industrial facilities.
• Radiological assessment of contaminated land, sediments and sludge.
• Construction material and product testing where radionuclide content must be evaluated.
• Research and emergency response requiring precise low-level plutonium determinations. Typical users: accredited environmental testing laboratories, national and local regulators, nuclear operators, academic researchers and consultants in radiological protection.

Related standards

• Part of the ISO 18589 series on radioactivity measurement in the environment.
• Cross-references ISO 18589-2 (general guidance on sampling and measurement practices) and other parts in the series for matrix- and technique-specific requirements.

Keywords: EN ISO 18589-4:2021, ISO 18589-4, alpha spectrometry, plutonium measurement, Pu-238, Pu-239+240, soil monitoring, environmental radioactivity, chemical separation, detection limit, radiological protection.