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 NRPP, AARST, NRSB, ICC, and IAC2
To become a NRPP Certified Radon Measurement Professional, you'll have to complete an approved course, pass the NRPP exam through PSI, and complete the NRPP application. Visit for details. As of July 7, 2014, this course is approved by NRPP for Entry Level Certification Training and Continuing Education.
Not a member? Join now to receive unlimited access to this course and all of InterNACHI's free online courses.  


As of July 7, 2014, this course is approved for Entry Level Certification Training and 16 Hours of 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.
Note for Illinois Radon Professionals:  The Advanced Radon Measurement Service Provider Course does not qualify for IEMA certification. The Illinois Advanced Radon Measurement Service Provider Course is approved with the Illinois Emergency Management Agency and qualifies for the certification.
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 Continuing Education 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.

Advanced Radon Measurement Service Provider Course

Course # 4104



Estimated hours for the average student

Academic Engagement

Reading online course instructional material at 140 words per minute


Taking quizzes


Taking the exam


Conducting a directed and independent inspection study performed according to the Standards of Practice, including the development of an inspection report 


Submitting an inspection and writing assignment

Submitting a research and writing assignment




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


Reading the downloaded student course book including taking the quizzes with the book

Reading, research, and studying related to completing the research and writing assignment
Studying and preparing for inspection processes according to a Standards of Practice, including capturing and storing digital images with a camera or device, making observations, evaluating conditions, deducing, formulating opinions, communicating observations in written form, attaining competency in performing inspections and using an inspection checklist or software and other inspection tools in producing a report. 



Sub Total


Overall Total

75.0 hours / 1.9 SCH

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. 

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