A worker's radiation survey meter clicks faster as it approaches the scale buildup inside the pipe. The reading climbs above the background.

Now what?

In that moment, having a clear decision tree for on-site NORM actions separates proper response from dangerous guesswork.

This practical guide provides step-by-step procedures for what to do when NORM is detected, from initial alarm to final waste disposition.

Whether you work in oil and gas production, pipeline maintenance, or facility operations, these decision trees will help your team act quickly, safely, and in full compliance with regulatory expectations.

The goal is straightforward: protect workers, contain contamination, notify the right people, and document every step.

Quick-Start Field Decision Tree

Use this simplified IF THEN logic when you encounter unexpected radiation readings on site.

Step 1: Detection

IF survey meter reading exceeds established background

1. Isolate the immediate area

2. Restrict all non-essential personnel access

3. Notify the Radiation Safety Officer (RSO) immediately

Step 2: Confirmation

IF repeat reading confirms elevation after instrument check

1. Perform contamination survey (smear test if applicable)

2. Identify material type: scale, sludge, soil, or equipment

3. Document reading with location, time, and instrument ID

Step 3: Threshold Decision

IF reading exceeds site action level or regulatory threshold

1. STOP WORK immediately

2. Implement engineering controls and appropriate PPE

3. Escalate to HSE management and regulator if required

IF reading is above background but below action level

1. Continue operations with monitoring and basic controls

2. Document all readings for ongoing awareness

Step 4: Waste Classification

1. Characterize material through sampling and lab analysis

2. Label and stage in controlled area

3. Arrange transport to approved disposal facility

4. Retain all documentation for compliance records

What Is NORM and TENORM?

NORM refers to Naturally Occurring Radioactive Materials found in the earth's crust. These materials become concentrated through industrial processes, creating TENORM or Technologically Enhanced Naturally Occurring Radioactive Material.

The International Atomic Energy Agency defines NORM as radioactive materials that exist in nature and are not significantly altered by human activity, while TENORM results from processes that increase the concentration or availability of these radionuclides.

In oil and gas operations, NORM accumulates in:

1. Pipe scale containing radium-226 and radium-228

2. Produced water and sludge from separators and tanks

3. Scale inside valves, pumps, and flow lines

4. Equipment surfaces exposed to produced fluids over time

Understanding these basic definitions helps workers recognize where NORM hazards may exist before work begins. For comprehensive worker training on recognition and response, consider specialized NORM awareness training programs.

Step 1: Confirm It Is NORM and Avoid False Alarms

Before initiating full NORM response procedures, confirm that elevated readings actually indicate NORM contamination rather than instrument error or temporary interference.

Establish Background Levels

Every site should have documented background radiation levels for comparison. Measure a control area known to be free of contamination. Compare these readings against the suspected area. A reading consistently 50% above established background warrants further investigation.

Perform Instrument Check

Verify that your survey meter is functioning correctly:

1. Check calibration date and ensure it is current

2. Confirm batteries are charged

3. Perform operational check on known source if available

4. Repeat the measurement at same location

5. Document instrument model, serial number, and reading

Distinguish Contamination from Fixed Radiation

Use smear tests to determine if radioactive material is removable:

1. Wipe a 100 square centimeter area with filter paper

2. Count the smear using appropriate detection equipment

3. Compare results to site removable contamination limits

4. Document all findings in the survey log

If readings confirm elevated radiation levels, proceed to immediate control actions. This confirmation step aligns with standard process hazard analysis methodologies used across industrial sectors.

Step 2: Apply Immediate Control Actions

Once NORM is confirmed, implement containment and isolation measures without delay. The goal is preventing worker exposure and stopping contamination spread.

Isolate and Secure the Area

1. Establish a radiation controlled zone with physical barriers

2. Post radiation warning signage at all access points

3. Limit entry to essential personnel only

4. Establish a log to track all personnel entering the area

Notify Key Personnel Immediately

1. Radiation Safety Officer (RSO)

2. HSE Manager

3. Site Supervisor

4. Regulatory authority if required by jurisdiction

Initiate Exposure Control Measures

Develop and implement an exposure control plan specific to the situation. This should address:

1. Engineering controls to contain contamination

2. Administrative controls limiting exposure time

3. Personal protective equipment requirements

4. Decontamination procedures for personnel and equipment

The response should mirror established exposure control plan principles adapted for radiation hazards.

Regulatory oversight varies by jurisdiction, but frameworks from the Health and Safety Executive and Environment and Climate Change Canada (ECCC) provide useful guidance on appropriate response levels.

Step 3: Stop-Work versus Continue Decision Matrix

Determining whether operations can continue or must stop depends on radiation levels relative to established thresholds. This decision tree provides clear guidance.

Understanding Action Levels

Site-specific action levels should be established based on:

1. Regulatory requirements in your jurisdiction

2. ALARA principles (As Low As Reasonably Achievable)

3. Type of work being performed

4. Potential for airborne exposure

5. Duration of worker exposure

Never invent action levels arbitrarily. Consult your Radiation Safety Officer and applicable regulations.

For additional guidance on identifying workplace hazards systematically, review established steps to identify a hazard in industrial environments.

PPE and Engineering Controls for NORM Work

Selecting appropriate controls requires matching protection to the specific NORM hazard present.

Engineering Controls

1. Wet methods: Use water sprays or mist to suppress dust during scale removal

2. Local exhaust ventilation: Capture airborne particles at the source

3. Containment barriers: Isolate work areas with plastic sheeting or enclosures

4. Remote handling tools: Maintain distance between workers and contaminated materials

5. Covered containers: Prevent contamination spread during waste staging

Personal Protective Equipment

PPE training offered by Canada Safety Training Centre can help the employee and employees understand the need and proper working on PPE and how it can prevent accidents in the workplace.

Decision logic for PPE selection

1. IF dry scale removal: Use wet methods for dust suppression + respiratory protection

2. IF sludge handling: Implement splash controls + contamination control measures

3. IF confined space entry: Follow specific safety measures for confined spaces in oil and gas protocols

Sampling, Labeling, and Laboratory Analysis

Proper characterization of NORM materials requires systematic sampling and documentation.

Representative Sampling Procedures

1. Collect samples from multiple locations within the contaminated area

2. Use clean sampling tools for each location to prevent cross-contamination

3. Place samples in sealed containers appropriate for the material type

4. Label each container immediately with unique identifier

5. Document sample location, depth, material type, and field reading

Chain-of-Custody Documentation

Maintain unbroken chain-of-custody for all samples:

1. Record each person handling the sample

2. Note date and time of each transfer

3. Document condition of sample upon receipt

4. Include analysis requested and turnaround requirements

Labeling Requirements

Each container must display:

1. Date of collection

2. Specific location (equipment ID, grid coordinates)

3. Material type (scale, sludge, soil, equipment)

4. Field radiation reading

5. Collector's name and contact

6. Laboratory name and address

Accurate documentation supports proper HSE incident management should any issues arise during handling or transport.

Waste Storage, Transport, and Disposal Decision Tree

Managing NORM waste requires following a structured path from generation to final disposal.

IF material confirmed as NORM through laboratory analysis:

1. Containerize in appropriate UN-approved containers

2. Label containers with radioactive material markings

3. Stage in designated controlled storage area

4. Characterize waste profile complete with radionuclide analysis

5. Select licensed transporter approved for radioactive materials

6. Arrange disposal at facility authorized to accept NORM waste

7. Retain all manifests and disposal certificates permanently

Temporary On-Site Storage Requirements

1. Store in secured area with restricted access

2. Maintain radiation signage on storage area entrance

3. Conduct weekly inspections of container integrity

4. Document storage conditions and any changes

5. Limit storage time to regulatory maximums

Approved Disposal Considerations

NORM disposal is strictly regulated. Facilities must:

1. Hold appropriate radioactive materials license

2. Accept the specific waste form (solid, liquid, sludge)

3. Provide final disposal certification

4. Maintain records for regulatory inspection

Documentation and Compliance Checklist

Proper documentation creates the audit trail required for regulatory compliance and liability protection.

Required Records

1. Initial survey log with all readings, locations, and instrument IDs

2. Instrument calibration certificates current and available

3. RSO notification documentation with dates and response actions

4. Incident report if exposure occurred or regulatory threshold exceeded

5. Waste manifests with complete chain-of-custody

6. Transport documentation including shipping papers

7. Final disposal certificates from licensed facility

8. Personnel exposure records and dosimetry results

9. Training records for all workers involved

Thorough documentation also supports effective post-incident analysis should any aspect of the response require review.

Common On-Site NORM Scenarios

Scenario 1: Hot Scale Inside Pipe

Detection: Worker surveys pipe before cutting, meter reads 3x background.

Action: Stop cutting immediately. Isolate pipe section. Notify RSO. Implement a wet cutting method. Use respiratory protection. Segregate cut pieces as radioactive waste. Document all readings.

Scenario 2: Sludge in Tank

Detection: Tank bottom sludge shows elevated readings during cleaning prep.

Action: Evacuate tank if workers are inside. Implement confined space protocols. Test for airborne radioactivity. Use supplied air if levels are elevated. Pump sludge into approved containers. Sample for lab analysis.

Scenario 3: Soil Contamination Near Equipment

Detection: Routine survey finds hot spot near former equipment staging area.

Action: Establish perimeter based on survey results. Grid the area for detailed mapping. Excavate contaminated soil under controlled conditions. Conduct confirmation monitoring after removal. Dispose as NORM waste.

Scenario 4: Waste Container Staging Area Reading High

Detection: Weekly storage inspection shows increased readings near containers.

Action: Verify container integrity. Check labeling and seals. Confirm waste classification matches container markings. Re-classify if analysis indicates higher activity. Enhance shielding if needed.

Jurisdictional Considerations

NORM regulations vary significantly by jurisdiction. This guide provides general principles, but specific requirements depend on your location.

Key Considerations

1. National radiation regulators set activity concentration limits

2. Environmental authorities govern waste disposal

3. Transportation regulations apply to off-site movement

4. Some jurisdictions exempt certain NORM concentrations

5. Reporting thresholds differ between regulatory bodies

Always consult:

1. Your organization's Radiation Safety Officer

2. National radiation protection authority

3. Environmental regulatory agency

4. Industry-specific guidance documents

Alignment with international safety guidance from the International Atomic Energy Agency provides a baseline for best practices regardless of jurisdiction.

Emergency Escalation Tree

While most NORM situations allow controlled response, unexpected high radiation spikes require immediate escalation.

IF unexpected high radiation reading occurs:

1. STOP WORK immediately

2. Evacuate all non-essential personnel from area

3. Secure the area with physical barriers

4. Notify RSO and site management without delay

5. Contact regulator if required by law

6. Initiate incident documentation procedures

7. Conduct exposure assessment for involved personnel

8. Preserve area for investigation

FAQ's

What do I do if NORM is detected on site?

Isolate the area immediately, restrict access, notify your Radiation Safety Officer, and document the reading. Do not continue work until the situation is assessed and appropriate controls are implemented.

What are NORM survey meter action levels?

Action levels are site-specific thresholds based on regulatory limits and As Low As Reasonably Achievable (ALARA principles). Your organization should establish these in advance with guidance from your RSO.

Common action levels range from 2 to 10 times background depending on the situation.

What triggers stop-work for NORM?

Stop-work is triggered when readings exceed established site action levels or regulatory limits, when there is potential for airborne exposure, when working with unknown materials, or when controls are inadequate for the measured activity level.

How is TENORM handled differently from NORM?

TENORM is regulated more stringently in many jurisdictions because industrial processes have concentrated the material.

Disposal requirements may be stricter, and reporting thresholds may be lower. Always verify specific requirements for your location.

Who regulates NORM disposal?

Regulation varies by jurisdiction but typically involves national radiation protection authorities, environmental agencies, and sometimes transportation departments.

In the United States, the Environmental Protection Agency (EPA) and state agencies share responsibility. In Canada, the Canadian Nuclear Safety Commission provides oversight.

What PPE is required for NORM cleanup?

PPE requirements depend on the material form and potential for exposure. Basic protection includes coveralls, gloves, and dosimetry. For dusty operations, respiratory protection with HEPA filters is essential. For liquid or sludge, splash protection is required.

How long can NORM waste be stored on site?

Storage time limits vary by jurisdiction and license conditions. Some areas allow temporary storage for up to one year, while others require more immediate disposal. Check with your regulator and facility license for specific time limits.

Conclusion

Effective on-site NORM actions depend on clear decision trees, trained personnel, and consistent documentation.

When radiation is detected, the path forward should never be a question. Workers need to know exactly what steps to take, who to notify, and how to protect themselves and others.

The decision trees presented in this guide provide a framework for response, but they must be adapted to your specific site conditions, regulatory requirements, and organizational policies.

Every facility handling materials that may contain NORM should have documented procedures, trained staff, and readily available survey equipment.

Take action today:

1. Review your current NORM procedures against this guide.

2. Ensure your team has the training and tools they need to respond appropriately.

3. Verify that your documentation systems capture the information required for compliance.

4. Confirm that your waste disposal pathways are established before you need them.

The moment of detection is not the time to figure out what to do. It is the time to execute a plan already in place. With proper preparation and clear decision trees, on-site NORM actions become routine responses rather than crisis events.