A new certified reference material IAEA-465 for radionuclides in Baltic Sea sediment

Area of Science:

• Environmental Science
• Nuclear Chemistry
• Marine Geochemistry

Background:

• Accurate radionuclide measurements in marine environments are crucial for environmental monitoring and safety assessments.
• The Baltic Sea is a unique marine ecosystem requiring specific reference materials for accurate analysis.
• Existing reference materials may not cover the full spectrum of radionuclides found in Baltic Sea sediments.

Purpose of the Study:

• To develop and certify a marine sediment reference material (IAEA-465) for radionuclide analysis.
• To provide a comprehensive set of natural and anthropogenic radionuclides for quality assurance.
• To support the validation of analytical methods and training in radionuclide measurements.

Main Methods:

• Development of a certified reference material (CRM) using Baltic Sea marine sediment.
• Characterization of natural radionuclides (e.g., 40K, 210Pb, 226Ra, 232Th, 238U) and anthropogenic radionuclides (e.g., 137Cs, 239+240Pu, 241Am).
• Interlaboratory comparison involving 27 laboratories using radiometric (alpha, gamma, beta spectrometry) and mass spectrometry (ICP-MS, AMS) techniques.

Main Results:

• Successful development of IAEA-465, a CRM for Baltic Sea marine sediment.
• Comprehensive characterization of 11 natural and 3 anthropogenic radionuclides, with information values for additional Pu isotopes.
• Demonstrated comparability of results across multiple laboratories and analytical techniques.

Conclusions:

• The IAEA-465 CRM is a valuable tool for ensuring the quality and reliability of radionuclide measurements in marine sediments.
• It facilitates method development, validation, and inter-laboratory comparisons.
• The CRM supports international efforts in environmental radioactivity monitoring and research.