EN ISO 18589-5:2021 PDF

Overview

EN ISO 18589-5:2021 - "Measurement of radioactivity in the environment - Soil - Part 5: Strontium‑90" specifies laboratory test methods for determining 90Sr activity in soil using proportional counting (PC) or liquid scintillation counting (LSC). The standard covers chemical separation techniques to obtain strontium and yttrium sources, measurement principles for 90Sr in equilibrium with 90Y (and 89Sr when present), and practical detection performance for environmental monitoring after routine discharges, accidental releases or global fallout.

Key topics and technical requirements

• Scope and principle: Measurement of pure beta emitters 90Sr (and equilibrium 90Y), including cases where 89Sr contributes (recent fallout).
• Chemical separation methods: Detailed procedures including precipitation, liquid–liquid extraction and chromatography (crown‑ether resin) to isolate Sr and Y from soil matrices.
• Source preparation: Methods for preparing counting sources suitable for LSC or gas flow proportional counters.
• Detection and counting: Guidance on background determination, counting efficiency calculation and measurement with proportional counters or liquid scintillation counters.
• Quality parameters: Procedures for determining chemical yields and standard uncertainty, plus formulas for activity calculation, decision threshold and detection limit.
• Performance examples: Using 20 g samples and 1 000 min counting, achievable detection limits:
  • ~0.1 to 0.5 Bq·kg‑1 for 90Sr when 89Sr can be neglected.
  • ~1 to 2 Bq·kg‑1 for both 90Sr and 89Sr when 89Sr is present.
• Applicability to other matrices: Methods can be adapted for sludge, sediment, construction materials and products with appropriate sampling.

Applications

• Soil monitoring after routine or accidental radioactive discharges and for assessment of global fallout.
• Post‑accident emergency response where rapid evaluation of 90Sr/89Sr in soils is required.
• Environmental laboratories conducting regulatory compliance testing, baseline surveys, or remediation verification.
• Research into radionuclide migration, deposition and long‑term environmental behaviour.

Who should use this standard

• Environmental and radiation protection laboratories performing Strontium‑90 analysis.
• Regulatory bodies and public‑health agencies requiring validated methods for soil radioactivity.
• Nuclear industry and emergency response teams responsible for environmental monitoring and impact assessment.
• Academic researchers studying radionuclide contamination and transport.

Related standards

• EN ISO 18589 is a multi‑part series addressing measurement of radioactivity in the environment; consult other parts of the ISO 18589 series for broader sampling and measurement context.

Keywords: EN ISO 18589-5:2021, Strontium‑90, 90Sr, soil monitoring, proportional counting, liquid scintillation counting, environmental radioactivity, detection limits, chemical separation.