Advanced Radon Measurement Service Provider Course

Welcome to InterNACHI's free online Advanced Radon Measurement Service Provider Course.
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As of July 7, 2014, this course is approved for Entry Level Certification Training and Continuing Education by:

Check your state/province requirements for performing radon measurements. A regulating body may require an individual to complete a state/province-approved course (such as InterNACHI's) and pass a state/province-approved certification exam (such as NRPP's national certification exam). View information about U.S. radon regulations. For Canadian certification, visit View a radon map of the U.S.

NRPP CE: Entry-level courses can be used one time as CE for recertification. 

*Illinois students must take the Illinois Advanced Radon Measurement Service Provider Course
Course Goal:
The goal of this course is to teach the student how to perform radon measurements.
Course Objectives:

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 
The course includes:
  • 137,092 words;
  • numerous graphics, images, illustrations, and tables;
  • 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.

Advanced Radon Measurement Service Provider Course

Course # 4102



Estimated hours for the average student

Academic Engagement

Reading and studying online course instructional material at 140 words per minute


Taking quizzes


Taking exam


Performing a self-guided assigned research exercise
Submitting an academic written essay assignment and applicable digital image and contributing to an academic online discussion




Studying & reviewing instructional material in preparation for taking quizzes and exam


Homework of reading, studying, and note-taking from the downloaded student study guidebook at 140 words per minute
Homework of preparing to perform an the assigned inspection activity, taking inspection images, developing observations and opinions, and writing assigned essays



Sub Total


Overall Total


Reminder to members:  InterNACHI's Code of Ethics 1.10 requires that you comply with all government rules and licensing requirements of the jurisdiction where you conduct business.  InterNACHI's courses and Standards generally exceed the Standards of Practice that you are required to abide by locally.
This course has been approved/accepted by:

For local information:

Approvals Related To Radon Certification Programs:
  1. Alabama Department of Public Health
  2. Alaska 
  3. Arizona Radiation Regulatory Agency
  4. Arkansas Department of Health
  5. California Department of Health Radon Services
  6. Colorado Department of Public Health & Environment
  7. Connecticut Department of Public Health
  8. Delaware Radon Program
  9. Florida
  10. District of Columbia Department of Environment
  11. State of Georgia
  12. Hawaii Indoor Air Quality Program
  13. Idaho Department of Health and Welfare
  14. Illinois
  15. Indiana State Department of Health
  16. Iowa Department of Health
  17. Kansas Department of Health and Environment's Radon Program
  18. Kentucky Department of Health Radon Program
  19. Louisiana
  20. Maine Division of Environmental Health Radon Section
  21. Maryland
  22. Massachusetts Health and Human Services
  23. Michigan Department of Environmental Quality
  24. Minnesota Department of Health
  25. Mississippi Radon Program
  26. Missouri
  27. Montana
  28. Nebraska Department of Health & Human Services
  29. Nevada Department of Health and Human Services
  30. New Hampshire Department of Environmental Services (NHDES) Radon Program
  31. New Mexico
  32. New York Department of Health
  33. North Carolina
  34. North Dakota Department of Health Radon Program
  35. Ohio Department of Health
  36. Oklahoma Department of Environmental Quality Radon Program
  37. Oregon Department of Public Health Radon Program
  38. Pennsylvania Department of Environmental Protection
  39. Rhode Island Department of Health Radon Program
  40. South Carolina
  41. South Dakota Department of Environment & Natural Resources
  42. Tennessee Radon Program
  43. Texas Radiation Control Program
  44. Utah
  45. Vermont Department of Health
  46. Virginia Radon Program
  47. Washington State Department of Health
  48. West Virginia Radiation, Toxics & indoor Air Division
  49. Wisconsin Department of Health Services
  50. Wyoming Department of Health


Course covers the following: 


                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-Resistant Homes

                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 Inspecting Radon Mitigation System

                Standards of Practice for Inspecting Radon Systems

    Code of Ethics

                Code of Ethics

                Quiz #13

Upon completion of this course and passing of 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 automatically logs completion into InterNACHI's online Continuing Education log.
Members will need their username and password.  If you have forgotten your password, CLICK HERE (instant response) or email and request it (don't forget your name). 
InterNACHI... #1 in inspection education. 

Archived Documents:

View 2014 approval.