Rare earth NORM testing characterizes naturally occurring radioactive materials associated with ores, concentrates, processing streams, and residues. Depending on the project, testing may include uranium and thorium concentrations, radionuclide-specific activity measurements, or a combination of chemical and radiological analyses.
For a buyer, processor, or project developer, the first question is what the results must establish. Verifying a concentrate specification, evaluating a process residue, and supporting a shipment assessment can require different information.
A laboratory request that simply says “test for radioactivity” may leave important requirements undefined. A better request identifies the material, its processing history, the intended decision, and the reporting requirements.
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What Are NORM and TENORM in Rare Earth Processing?
NORM means naturally occurring radioactive material. TENORM describes naturally occurring radioactive material whose concentration or accessibility has been altered by human activities.
The US Environmental Protection Agency identifies mineral extraction and processing among the activities that can produce TENORM. Its rare earth guidance explains that separating uranium and thorium from rare earth minerals can generate TENORM wastes. [1, 2]
This distinction matters when designing a testing program. An incoming mineral concentrate, a separated product, and a process residue are different materials. Results from one should not automatically be used to characterize another.
For readers new to the underlying materials, see what rare earth minerals are and the elements they contain.
When Should You Discuss NORM Testing With a Laboratory?
Consider a laboratory consultation when you need to characterize:
- Incoming ores or concentrates before purchasing or processing.
- Monazite-bearing materials with incomplete supplier documentation.
- Processing intermediates and products after separation or treatment.
- Tailings, sludges, or residues for a defined management or acceptance decision.
- Materials intended for shipment where further characterization is needed.
- Supplier claims that require independent verification.
These are different testing objectives. Describe the decision before selecting the analytical package.
For example, a procurement team may need confirmation of uranium and thorium concentrations against a purchasing specification. A residue assessment may require information about particular radionuclides and their activities. Neither objective should be assumed to be satisfied by a generic rare earth assay.
Is a Uranium and Thorium Assay the Same as NORM Testing?
Not necessarily. A chemical assay and a radiological analysis describe different properties.
| Result | What it describes | What to clarify |
|---|---|---|
| Uranium or thorium in ppm, mg/kg, or percent | Elemental mass concentration | Whether total element or isotope-specific information is required |
| Radionuclide activity in Bq/kg or Bq/g | Radioactive decays per unit time per unit mass | Which radionuclides were measured and how |
| Gross alpha or beta activity | An aggregate measurement under a specified procedure | Whether screening alone answers the project question |
| A radiation survey measurement | A measurement under particular field conditions | Whether separate laboratory characterization is needed |
Health Canada’s NORM guidance makes the limitation explicit:
“there is not one test method that will verify the activities of all NORM radionuclides”
The guidance discusses the need to select methods according to the radionuclides of interest. A single package name therefore should not substitute for a defined analytical scope. [3]
If your existing report lists only total uranium and thorium, ask whether it supplies the information required for the intended decision.
Which Laboratory Methods Are Used for Rare Earth NORM Testing?
A testing program may combine techniques. Request the laboratory’s recommended approach and its limitations rather than specifying an instrument alone.
Gamma-Ray Spectrometry
Gamma-ray spectrometry can identify and measure suitable gamma-emitting radionuclides. Ask which radionuclides the laboratory reports directly, which are assessed through decay products, and what assumptions support that interpretation.
Confirm the required sensitivity, sample preparation, measurement time, and any conditioning period.
Chemical Analysis for Uranium and Thorium
Elemental analysis can support material specifications and composition checks. Depending on the method, mass spectrometry can also provide isotope-specific information.
Confirm whether the proposed preparation adequately decomposes the material and whether the analytical range covers the expected concentrations.
Chemical composition should not be treated as a complete radiological characterization without evaluating the information required.
Gross Alpha, Gross Beta, and Other Radiochemical Analyses
Gross alpha and beta measurements may be useful within a defined screening program. Additional radionuclide-specific work may be required.
For an example of the breadth of available services, SGS lists radiation analytical capabilities (opens in a new tab) covering gross alpha and beta, uranium- and thorium-series radionuclides, and several sample types. This illustrates why scope selection matters; it is not a recommendation that every sample needs every analysis. [4]
Which Standards and Guidance Should You Ask About?
Standards should help define suitable work, rather than appear as decorative references in a quotation.
ISO 18589-3:2023 addresses gamma-ray spectrometric measurement of gamma-emitting radionuclides in soil and related materials. Its scope includes materials associated with NORM and TENORM, including certain ores, sediments, and sludges. Ask the laboratory whether the standard fits your matrix and required measurements. It is not a universal method for every rare earth product. [5]
ISO/IEC 17025 addresses laboratory competence, impartiality, and consistent operation. Where accreditation is relevant, request the current scope and confirm that it covers the activities you are commissioning. Accreditation does not automatically extend to every test a laboratory offers. [6, 7]
The Multi-Agency Radiological Laboratory Analytical Protocols Manual, or MARLAP, provides another useful planning reference. Its data quality objectives approach starts with the decision and the type, quantity, and quality of information needed to support it. [8]
How to Request a Rare Earth NORM Testing Quote
An effective request gives prospective laboratories enough information to recommend comparable scopes.
| Information to provide | Why the laboratory needs it |
|---|---|
| Material description | Ore, concentrate, oxide, residue, soil, sludge, and water require different approaches |
| Processing history | Helps the laboratory assess relevant constituents and interpretation issues |
| Intended use of results | Defines whether the work supports procurement, characterization, or another decision |
| Existing results | Provides context for expected concentrations and previous methods |
| Sample count and approximate quantity | Supports preparation and scheduling |
| Required analytes or radionuclides | Establishes the proposed reporting scope |
| Required sensitivity | Helps determine whether the method can answer the question |
| Reporting units and moisture basis | Makes results interpretable and comparable |
| Project location and destination | Helps identify applicable acceptance and documentation requirements |
| Deadline | Allows discussion of realistic completion dates |
| Quality and reporting requirements | Clarifies uncertainty, supporting data, accreditation, and subcontracting needs |
If you do not know the appropriate radionuclide list or sensitivity, say so. Ask the laboratory to propose a scope and explain what it will—and will not—establish.
Example Testing Inquiry
“We are seeking laboratory characterization of a rare earth concentrate containing monazite. The results will support supplier qualification and evaluation of further handling requirements. Please recommend a chemical and radiological testing scope, including relevant uranium- and thorium-series measurements, required sample quantity, reporting limits, quality-control information, sample acceptance conditions, turnaround, and an itemized quotation.”
This is a starting point for discussion, not a universal testing specification.
How to Compare Laboratory Proposals
Compare the technical scope before comparing the total fee.
Check whether each proposal includes the same material preparation, analytes, radionuclides, reporting limits, uncertainty information, and deliverables. Ask which work is performed in-house and which is subcontracted.
Also establish:
- What additional testing could be triggered by the initial results.
- Whether additional work requires your approval.
- Whether technical interpretation is included.
- How samples and retained portions will be managed.
- Whether the report will meet the intended recipient’s requirements.
A lower quotation may represent a narrower investigation. A more extensive package may include work your project does not need.
What Should a NORM Laboratory Report Include?
Look for traceable sample identification, analytical methods, reported radionuclides or elements, units, reporting basis, and relevant limitations.
For activity measurements, request suitable detection information and measurement uncertainty. Ask the laboratory to explain any assumptions used to interpret results.
“Not detected” should not be read as an unqualified statement that no radioactivity is present. Interpretation depends on the measurement capability and the question being asked. Establish suitable data requirements during planning, consistent with the MARLAP approach. [8]
For related purchasing documentation, read how certificates of analysis work in rare earth trade.
Do NORM Results Automatically Determine Shipping or Regulatory Status?
No. Laboratory data support an assessment; the report alone does not necessarily establish the applicable legal classification or authorize a shipment, operation, or disposal route.
In the United States, uranium- and thorium-bearing materials can raise source-material questions under the Nuclear Regulatory Commission’s framework. The classification and applicable provisions depend on the material and circumstances. [9]
Before sending samples, obtain the receiving laboratory’s acceptance instructions. Have the applicable shipping requirements assessed by appropriately qualified personnel using the actual material information.
Find Laboratory Support for Rare Earth NORM Testing
A clear testing request helps laboratories respond with suitable methods and meaningful quotations.
Whether you are qualifying a supplier, assessing a concentrate, or characterizing a residue, start with the material, the decision, and the information you need.
Explore the REEx Marketplace (opens in a new tab) to investigate service providers, or contact REEx Connect with your testing requirements. Include your sample type, project location, existing results, intended use, and deadline.
References
- US EPA: Naturally Occurring Radioactive Materials and TENORM (opens in a new tab)
- US EPA: TENORM—Rare Earths Mining Wastes (opens in a new tab)
- Health Canada: Canadian NORM Guidelines, Volume III—Transportation (opens in a new tab)
- SGS: Radiation Analytical Services (opens in a new tab)
- ISO 18589-3:2023—Gamma-Ray Spectrometry (opens in a new tab)
- ISO/IEC 17025:2017—Laboratory Competence (opens in a new tab)
- International Accreditation Service: Laboratory Accreditation and Scope (opens in a new tab)
- US EPA: MARLAP Manual and Supporting Documents (opens in a new tab)
- US Nuclear Regulatory Commission: Source Material (opens in a new tab)
