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. Take the free, online course now.

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.   Note that New Jersey radon licensing is separate from NRPP certification. If a radon professional is interested in becoming 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 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


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-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.