Advanced Radon Measurement Service Provider Course

Welcome to InterNACHI's free online "Advanced Radon Measurement Service Provider Course." This free, online course is approved by NRSB, ICC, and IAC2. This course is provided by our tuition-free college, InterNACHI® School.

Take the free online course now.

This course is approved for continuing education credits by the NRSB. This course is also approved for New Jersey residents looking to take the state radon test through the NRPP. New Jersey radon licensing is separate from NRPP certification. If a radon professional wants to become an NRPP radon-certified technician, please check your state page for the appropriate radon education requirements


The goal of this course is to teach the student how to perform radon measurements.


Upon successful completion of this course, the student shall be able to:

  • describe the physics of radon;
  • describe the health effects of breathing radon;
  • list the ways radon enters a home;
  • describe the testing procedures for radon;
  • follow protocols in non-real estate transactions;
  • follow protocols in real estate transactions;
  • develop and follow a quality assurance plan and implement quality control procedures;
  • properly use passive devices;
  • properly use active devices;
  • test for radon in water and how to remove radon from water;
  • list different ways to approach radon mitigation in homes;
  • install effective mitigation systems in new homes;
  • install materials and follow procedures to build radon-resistant homes;
  • inspect radon mitigation system; and
  • abide by a Code of Ethics.

Some states regulate and certify providers of radon measurement and mitigation services. Contact your state for more information by visiting

Course includes:

  • 16 InterNACHI® CE credit hours;
  • 137,758 words;
  • student book;
  • inspection and writing assignment;
  • research and writing assignment;
  • 123 quiz questions in 13 quizzes;
  • 120-question InterNACHI course exam (this is not NRPP's certification exam);
  • instant grading; and
  • a downloadable, printable Certificate of Completion.

You will learn the following topics: 

  • Introduction
                What is Radon?
    Physics of Radon
                Why Some Atoms are Radioactive?
                Pioneers in Radioactivity
                Non-Ionizing and Ionizing
                Non-Ionizing Radiation
                Ionizing Radiation
                Alpha Particles
                Beta Particles
                Gamma Rays and X-Rays
                Where Does Radon Come From?
                Who Discovered Radon?
                Uranium Decay Chain           
                Radon Half-Life
                Curies, Equations, and ER
                Quiz #1
    Health Effects
                Health Risks Introduction     
                Health Effects of Radon
                Radon Causes Lung Cancer
                Genetic Damage Caused by Radon
                Risk Assessment Facts
                Quiz #2
    Radon Entry
                Exposure to Radon
                Radon Entry into a House
                Radon Potential
                Geology of Radon
                How Does Radon Change in the Environment?
                How Are People Exposed to Radon?
                How Does Radon Get Into the Body?
                How Can Radon Affect Your Health?
                Medical Test to Determine Exposure?
                Protecting People from Radon
                Protect Yourself and Family
                What is EPA Doing About Radon?
                Quiz #3
    General Testing Procedures
                General Procedural Recommendations
                Action Levels, Mitigation, and Water
                Short-Term Tests
                Long-Term Tests
                Initial Client Interview
                Measurement Locations
                Radon Measurement Duration
                Written Measurement Guidance
                Quality Assurance in Radon Testing
                Calibration Measurements
                Known Exposure Measurements
                Background Measurements
                Duplicate Measurements       
                Routine Instrument Performance Checks
                Operating Procedures
                Reporting Test Results
                Accuracy & Precision
                Interpretation of Side-by-Side Results
                Recommendations for Mitigation
                Temporary Risk-Reduction Measures
                Worker Safety
                Quiz #4
    Non-Real Estate Protocols
                Radon Measurement Protocols
                Citizen�s Guide to Radon
                Measurement Location
                Initial Measurements
                Closed House Building Conditions
                Interpretation of Initial Results
                Follow-Up Measurements
                Short-Term and Long-Term
                Follow-Up Testing
                Quiz #5
    Real Estate Protocols
                Home Buyer�s and Seller�s Guide
                Sequential Testing
                Simultaneous Testing
                Single Test Option
                Measurement Location
                Measurement Checklist
                Interference-Resistant Testing
                Influencing the Test Area�s Concentration
                Equipment Interference
                Preventing Interference
                Interference-Resistant Detectors       
                Quiz #6
    QA and QC
                QA and QC Defined
                Elements of a QA Program for Radon
                Quality Management
                QA Documentation & Reporting      
                Quality Control         
                QA Plans
                Analysis & Interpretation of QC
                Quiz #7
    Passive Devices
                General Considerations for Passive & Active
                Continuous Working-Level Monitor CW
                Alpha-Track Detectors (AT or ATD)
                Electret Ion Chamber Radon Detectors (EC, ES, EL)
                Activated-Charcoal Adsorption Devices (AC)
                Charcoal Liquid Scintillation (LS)
                Grab Sampling Bag & 3-Day Scintillation Cells
                Unfiltered Track Detection (UT)
                Quiz #8
    Active Devices
                Radon Progeny-Integrating Sampling Units
                Grab-Sampling Working Level (GW)
                Continuous Radon Monitors (CR)
                Quiz #9
    Mitigation for Existing Homes
                Reference Documents
                Description of Terms
                General Practices       
                Building Investigation
                Worker Health & Safety
                System Design
                System Installation
                Monitors & Labeling
                Post-Mitigation Testing
                Contracts & Documentation
                Quiz #10
    Mitigation for New Homes
                EPA Model Standards for New Residences
                Reference Documents
                Description of Terms
                Principles for Construction   
                Summary of Model Building Standards
                Construction Methods          
                Recommended Procedures
                Building Standards & Techniques
                Quiz #11
    How to Build Radon-ResistantHomes
                Building Radon Out
                Building the Framework: Introduction
                Digging Deeper: Questions and Answers
                How Does Radon Enter a House?
                Does Foundation Type Affect Radon Entry?
                Should All New Homes Be Built Radon-Resistant
                Nuts and Bolts: Installation Guide
                Installation: Step 1
                Installation: Step 2 & 3
                Installation: Step 4
                Installation: Step 5
                Installation: Step 6
                Installation: Step 7
                Optional Step 8: Activating the System
                Sold: Working with Home Buyers
                Appendix A: Architectural Drawings
                Appendix B: Glossary
                Appendix C: For More Information
                Appendix D: State Radon Contacts
    Radon in Water
                Radon in Water
                Removal of Radon in Water
                Quiz #12
    Standards for InspectingRadon Mitigation System
                Standards of Practice for Inspecting Radon Systems
    Code of Ethics
                Code of Ethics
                Quiz #13


Advanced Radon Measurement Service Provider Course
Course #4104, Student Catalog 

Student WorkTime CalculationEstimated Clock Hour Time for the Average Student
Attendance for "Seat Time" 1# of minutes of student attendance / 5052.9
Participation in Learning Activities 2# of minutes of online student participation / 503.0
Interactivity 3# of minutes of student interactivity / 500.5
Reading the Course Text 4# of words in the course / 100 words per minute / 5027.6
Reading the Course Textbook 5# of words in the book / 100 words per minute / 50 / 213.8
Academic Engagement 6# of words in the course / 100 / 503.0
Direct Communication 7# of minutes of communication / 500.5
Instructional Video Learning 8# of minutes of video / 500.0
Reinforcement Q & A  9# of questions X 1.85 / 504.5
Writing Assignment of the Inspection  102.0 hours per assignment2.0
Writing Assignment of the Research  114.0 hours per assignment4.0
Academic Activities for an Inspection  126.0 hours for each inspection assignment6.0
Performing an Inspection  138.0 hours for each inspection8.0
Total clock hours
73.0 clock hours
73.0 InterNACHI CE Hours
7.3 CEU

Upon completion of this course and passing the course exam, the student can download and print their own Certificate of Completion, which is auto-generated in their own name. 

The student's (InterNACHI member's) information is recorded on InterNACHI's servers for membership compliance verification, and the completion is automatically entered into InterNACHI's online Continuing Education log.