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Development of a neutron-activated concrete powder reference material
1National Physical Laboratory, Teddington, UK. arvic.harms@npl.co.uk
Summary
A new neutron-activated concrete powder reference material was developed from a decommissioned nuclear reactor. This material allows for accurate radionuclide measurements, crucial for environmental radioactivity assessments.
Area of Science:
- Nuclear Engineering
- Materials Science
- Environmental Science
Background:
- Nuclear reactors utilize concrete bioshields for radiation shielding.
- Concrete bioshields become activated with radionuclides after prolonged reactor operation.
- Characterizing activated concrete is essential for decommissioning and waste management.
Purpose of the Study:
- To develop a neutron-activated concrete powder reference material.
- To establish consensus-based assigned values for key radionuclides in the material.
- To support accurate environmental radioactivity measurements and inter-laboratory comparisons.
Main Methods:
- Core samples from a decommissioned nuclear reactor bioshield were used.
- A consensus method involving 33 organizations from 15 countries was employed.
- Measurements were conducted as part of the NPL Environmental Radioactivity Proficiency Test Exercise 2008.
Main Results:
- Assigned specific activity values (Bq g⁻¹) were determined for Cobalt-60, Barium-133, Europium-152, and Europium-154.
- Indicative values were obtained for Tritium (total and leachable), Carbon-14, Potassium-40, Iron-55, and Nickel-63.
- The development provides a valuable reference material for radionuclide analysis.
Conclusions:
- The developed neutron-activated concrete powder serves as a reliable reference material.
- The consensus-based approach ensures the quality and comparability of radionuclide data.
- This material aids in the accurate assessment of radioactivity in nuclear decommissioning contexts.
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