SIST EN ISO 18589-3:2024

Overview

EN ISO 18589-3:2024 - Measurement of radioactivity in the environment - Soil - Part 3: Test method of gamma‑emitting radionuclides using gamma‑ray spectrometry (ISO 18589‑3:2023, corrected 2024‑08) specifies a non‑destructive laboratory method for identifying and measuring activity of many gamma‑emitting radionuclides in soils and related materials. The method applies to large‑volume samples (up to about 3 L) and covers photon energies from 5 keV to 3 MeV (practically most radionuclides fall between 40 keV and 2 MeV). It can be implemented with germanium or other detectors having resolution better than 5 keV.

Key topics and technical requirements

• Principle and scope: Single‑measurement determination of all γ‑emitters present in a sample within the stated energy range.
• Detector and equipment: Types of detectors (e.g., HPGe), cryostats/coolers, shielding, analogue/digital acquisition and DSP electronics.
• Calibration:
  • Energy calibration and efficiency calibration (laboratory reference sources and numerical methods).
  • Reference to ISO 20042 for generic gamma‑ray spectrometry fundamentals.
• Sample handling: Packaging, large‑volume containers, and guidelines for crushing unsieved material (>200 μm or 250 μm) per ISO 18589‑2 when homogeneity is required.
• Corrections and data processing:
  • Dead‑time and pile‑up, decay corrections, self‑attenuation/self‑absorption, and true coincidence summing corrections.
  • Background contributions, interference from other radionuclides, and calculation of activity per unit mass.
• Quality assurance: Laboratory background assessment, quality control procedures, uncertainty estimation, decision thresholds and detection limits.
• Reporting: Required contents of the test report and informative annexes on natural radionuclides, self‑attenuation, summing, and spectrum analysis.

Practical applications

• Environmental surveillance and long‑term monitoring of soil radioactivity.
• Radiation protection assessments for public health, emergency response and post‑accident evaluation (rapid soil screening).
• Monitoring of NORM/TENORM in mining, mineral sands, phosphate fertilizer production, sludge and sediments.
• Inspection of contaminated or suspect sites (urban/industrial soils, construction rubble, pottery, rock and ore).
• Routine radioactivity testing in accredited laboratories using gamma‑ray spectrometry.

Who should use this standard

• Environmental and radiological protection laboratories and authorities.
• Accredited testing laboratories performing routine gamma spectrometry.
• Mining and mineral processing industry teams monitoring NORM/TENORM.
• Academic and research labs analyzing soil and construction materials.
• Emergency response and site‑inspection units requiring rapid gamma‑activity evaluation.

Related standards

• ISO 20042 - generic test method and fundamentals for gamma‑ray spectrometry.
• EN/ISO 18589‑2 - sample preparation (crushing and homogeneity) referenced for unsieved material.

Keywords: EN ISO 18589-3:2024, gamma spectrometry, gamma-emitting radionuclides, soil radioactivity, environmental monitoring, NORM, TENORM, germanium detector, detection limit, efficiency calibration.