Why radiation safety matters in REE projects
Radiation is easy to overlook because we cannot see it, smell it, or feel it in the moment. Yet it is a natural part of our environment, and it becomes especially relevant when we start moving, crushing, concentrating, dissolving, and refining rocks. The REMHub radiation safety webinar in November 2025 highlighted a simple idea with major practical consequences: radiation safety works best when it is treated as a design parameter in process development, not as a late compliance check once flowsheets and facilities are already fixed.
In an industrial context, the key concern is ionizing radiation, meaning radiation is energetic enough to remove electrons from atoms and molecules. It matters because it deposits energy in living tissue. At sufficient doses this can injure cells and raise long term health risks, including DNA damage from direct ionization events or secondary chemical reactions. Radiation protection therefore focuses on understanding sources and exposure pathways and keeping doses controlled through sound design and everyday work practices.
How natural radioactivity shows up in processing
Rare earth and critical metal ores can contain naturally occurring uranium and thorium, and their decay series radionuclides. The crucial point is that mining and processing can redistribute these radionuclides into dusts, process waters, secondary precipitates, residues, and wastes, sometimes concentrating them unintentionally as material is upgraded and separated. Exposure pathways are often practical and physical: crushing, handling, and drying generate dust, which can transport radionuclides when uranium or thorium bearing mineral grains are present, and process waters can also mobilize radionuclides depending on mineralogy and geochemical conditions.
From a process developer’s perspective, radiation safety becomes tightly linked to metallurgy. Rare earth refining aims for a high purity product, so uranium and thorium cannot remain in the final rare earth stream. They must be separated into side streams. That separation is a success for product quality, but it can create more uranium and thorium rich fractions that require deliberate handling, measurement, and waste planning.
The Finnish regulatory approach in brief
In Finland, the regulation of activities involving exposure to natural radiation is pragmatic: it focuses on whether exposure is created and whether it can be demonstrably controlled. Unless a specific license is required, NORM involving industrial activities are treated as existing exposure situations, with an emphasis on notification, exposure assessment, and selecting appropriate management pathways for residues and wastes. Within this framework, NORM residues are not automatically classified as radioactive waste; instead, waste routes are chosen primarily under waste and environmental legislation, with radiation safety requirements applied through assessment and approval steps when activity concentrations exceed clearance levels.
Reference levels illustrate how this decision logic works in practice. For NORM related exposures, the reference level is 1 mSv per year for workers and 0.1 mSv per year for the public, while radon, cosmic radiation, and building materials are addressed separately. Once exposures are understood, controls follow familiar industrial safety logic: minimize time near sources, increase distance where feasible, and use shielding when appropriate, supported by planning, guidance, suitable protective equipment, and clear labelling. This is the practical expression of optimization and the ALARA principle in everyday operations.
Residues and wastes are where this becomes operationally concrete. If activity concentrations exceed clearance levels, an approval process applies for disposal, reuse, recycling, or recovery routes. Because disposal pathways are selected primarily under waste and environmental legislation, chemical hazards and waste codes remain central to choosing the route. Approval for the selected management pathway is supported by an exposure assessment for workers and the public together with the required documentation, ensuring the route is both legally compliant and robust from a radiation protection perspective.
Safeguards: a second regulatory layer
For rare earth processing, there is another dimension that can be overlooked if radiation is seen only as a workplace exposure issue. In some situations, uranium and thorium in mineral processing can also be treated as nuclear materials under the Finnish framework. This means certain types of handling may require a notification or a license. Producing or manufacturing nuclear material is a licensable activity, and exporting nuclear material, including some processed ore concentrates, may require an export license. In practical terms, this matters because refining can separate uranium and thorium into specific side streams, raising a natural question for process developers: if uranium or thorium accumulates into a particular fraction as part of normal processing, does that count as “production” in the legal sense even when there is no intention to use these elements for energy production. Currently, the safeguards rules are evolving and nuclear energy legislation in Finland is under renewal, while the general logic of license or notification is expected to remain.
Designing safety into the flowsheet
Seen together, these perspectives explain why designing radiation safety into the flowsheet is the only scalable approach for critical raw materials. If uranium and thorium are part of the feed, they need to be followed through the process, not only checked at the front end. If dust and process waters are realistic exposure routes, controls must be embedded in equipment choices, ventilation, sampling routines, housekeeping, and residue management. If the flowsheet inevitably creates more uranium and thorium rich fractions, safeguards awareness needs to be part of early planning rather than something discovered late in piloting or commissioning.
This is also the direction reflected in REMHub piloting work presented by the Oulu Mining School, which described a stepwise approach centered on radiation risk assessment and investigation reporting for a realistic mineral processing case. It also outlined a broader plan for managing uranium and thorium across processing and waste management at pilot scale, moving from laboratory flotation tests to pilot scale concentrator work, supported by on site method development and close cooperation with the competent authority along the processing chain.
The key takeaway here is not that rare earth projects are inherently more dangerous, but that their processing flows can make radiation-related questions more visible and therefore worth addressing early. When society asks for cleaner energy and electrification, we also inherit the responsibility to handle the full geochemical reality of the materials that make these technologies possible. Radiation safety, approached early and systematically, supports responsible innovation: it protects workers, strengthens environmental performance, reduces regulatory uncertainty, and reinforces the social license that critical raw materials projects ultimately depend on.
You can access the materials from the Radiation safety webinar here.