SENSOR CALIBRATION | RADIATION MONITORING
Mixing it up with radionuclides
Mixed radionuclide solutions are critical to calibrating gamma spectrometry
devices for a wide range of industrial and environmental monitoring applications. As demand for accurate and traceable radioactivity measurements continues to grow, maintaining confidence in the measurement systems is key.
By Dr Steven Bell, senior scientist, Nuclear Metrology Group at NPL
ACCURATE RADIOACTIVITY MEASUREMENTS are required for activities ranging from environmental monitoring and nuclear decommissioning to industrial operations and research. Gamma spectrometry is one of the most widely used techniques for identifying and quantifying gamma- emitting radionuclides, helping laboratories to generate the data needed to meet safety and compliance targets, as well as make operational decisions. Achieving reliable results depends on effective calibration, helping to ensure that measurements remain accurate and comparable across instruments and laboratories. Mixed radionuclide solutions play an important role in this process, providing multiple calibration reference points within a single standard and helping laboratories to establish traceable calibration across a broad range of gamma-ray energies. As demand for accurate and reproducible measurements continues to grow, these solutions remain an important part of the infrastructure that underpins gamma spectrometry measurement programmes.
Calibration is key Calibration offers assurance that measurement systems
are producing accurate and reproducible results. Without it, detector response can drift over time, affecting data quality and comparability between instruments and laboratories. For gamma spectrometry users, calibration is not simply a routine requirement, but the process that links measurement results to recognised standards, delivering the foundation for reliable radionuclide identification and activity determination. Effective calibration also helps to ensure that
measurements remain traceable and comparable over time and between organisations. This is particularly important in regulated environments, where measurement results may inform operational, environmental or compliance-related decisions. Calibration standards can contain either a single
radionuclide or a mixture of radionuclides, and both approaches have an important role to play in gamma spectrometry. Single radionuclide standards provide a well-characterised reference point at a specific gamma-ray energy. They can be useful when a particular radionuclide is of interest or when users need to investigate specific aspects of detector performance.
By delivering a practical means of establishing calibration across various gamma-ray energies, mixed radionuclide solutions allow multiple calibration reference points to be measured from a single reading. Source: Yushchuk Myroslava/ Shutterstock.
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