Training Provider Info

Radon Measurement Technician

Documents from which NRSB Radon Measurement Examination Questions are taken
Revision 2, March 5, 2007
(It is anticipated that this list will be updated from time to time and be posted at
1) A Citizen's Guide to Radon: The guide to Protecting Yourself and Your Family from Radon (EPA 402-K-12/002, December 2016)
2) Consumer's Guide to Radon Reduction: How to Fix Your Home (EPA 402-K-10/005, December 2016)
3) Home Buyer's and Seller's Guide to Radon (EPA 402-K-13/002, September2013)
4) Standard Practice for Installing Radon Mitigation Systems in Existing Low-Rise Residential Buildings (ASTM E-2121-13)
5) Builders:Building New Homes with Radon-reducing Features-EPA recommends the ASTM E1465-08 standard for radon-reducing features in new homes.

6) Radon Reduction Techniques for Detached Houses Technical Guidance (Second Edition) (EPA/625/5-87/019, Revised January 1988)
7) Radon Reduction Techniques for Existing Detached Houses Technical Guidance (Third Edition) for Active Soil Depressurization Systems (EPA/625/R-93/011, October 1993)
8) Final Report Reducing Radon in Structures (EPA Contract Number 68-D-90170, Work Assignment 2-46, December 1992)
9) Technical Support Document for the 1992 Citizens Guide to Radon (EPA 400-R-92-011, May 1992)
10) Indoor Radon and Radon Decay Product Measurements Device Protocols (EPA 402-R-92-004, July 1992)
11) Protocols for Radon and Radon Decay Product Measurements in Homes EPA Document Number 402-R-93-003, June 1993

12) Radon Measurement in Schools Revised Edition (EPA 402-R-92-014 July 1993)

13) For Testing HUD Multi-family Buildings, the NRSB does recognize sections of the ANSI-AARST (MAMF) Protocol for Conducting Radon and RDP Measurements in Multi-family Buildings - 2012 as required by HUD.  To read or download the HUD Radon documents, go to
     4.  Testing Protocols.
     a.  Radon testing must follow the protocols set by the American Association of Radon Scientists and Technologists, Protocol for Conducting Radon and Radon Decay Product Measurements in Multi-family Buildings (ANSI-AARST MAMF-2010, Section III (or similar section in the most recent addition), (available at  1.  Exception: With reference to Section III.3.1 of ANSI-AARST MAMF-2010 (or similar section in the most recent edition). the minimun number of apartments to be tested shall be at least twenty-five percent of randomly selected ground level units. b. Threshold for unacceptability: 4.0 picocuries per liter (4.0 pCi/L) based on initial and any confirmatory testing, if performed.

     5.  Resident Notification.
     a.  Testing.  Resident of all new applications for Multi-family MAP and TAP programs shall be performed of forthcoming testing in the manner described in ANSI-AARST MAMF-2010, Section II.B and Section III.2.2.1 (or similar sections in the most recent edition).b. Mitigation. Resdidents shall be informed both prior to and after mitigation activities.  In the case of new construction, incoming residents shall be informed of radon mitigation activities.


Radon Measurement Technician Course Curriculum (1)
One-Day Course
Revised July 1, 2001

A minimum of eight hours of classroom instruction time is required for this course.  A maximum of two hours is allowed for a 75 question closed book examination.  Only after a student finishes the classroom portion of the course, may he/she sit for the examination. The class room work and the examination may be completed on the same day or the examination may be completed on a subsequent day.
A student must answer at least 70.65% (53 of 75) examination questions correctly to obtain a passing grade.
Determining the amount of time allocated to the various sections of this curriculum is not mandated; this determination is left to the discretion of the instructor.  It is not mandated that all eight hours of classroom instruction be completed in a single day.  However, to provide guidance for the instructor, the course curriculum indicates the approximate number of examination questions that will be associated with each section of the curriculum.
The course instructor must maintain a classroom attendance log for each student, which accounts for the time the student spent in the classroom.  
I.  Basic Concepts (9 questions)
Radiation - alpha, beta, gamma
Inert gas
Uranium (mineral) > Radium (mineral) > Radon (gas) > Progeny (solids)
Radon progeny
Units: pCi/l, WL, Bq/m3, WLM
Typical concentrations indoor/outdoor
Action level
Gas transport:
From soil: diffusion, permeation, mixing/dilution
From water: dissolution/aeration
Sources: soil, rock, building materials, water
Radon entry into house
(1) Based on "A Radon Curriculum for Professional Home Inspectors," presented by Stephen Shefsky and Robert Juliano at the 1998 AARST International Symposium.
II. Health Effects (9 questions)
Gas > progeny > (attachment) > lungs > alpha radiation > lung cancer risk
Dose-response model
Evidence of radon link to lung cancer (miner studies)
Residential studies
Extrapolating mines to homes
Radon-in-water > aeration > inhalation > lungs > known risk
Radon-in-water > ingestion > stomach/intestines/bloodstream > risk (?)
Synergistic effect with smoking
Risk at EPA action level
What level is “safe”?
Comparative risks: auto accidents, drowning, other radiation exposures, etc.
If you don't know the answer refer client to EPA or State
III. Radon Test Methods (9 questions)
Test purposes: screening, follow-up/confirm, diagnostic, post-mitigation, maintenance,   research/other
Duration: long term, short term, grab
Strategy: passive, active
Integrating vs. continuous
Screening protocol goals
Devices: passive/ active, short term/long term
Passive:  Short Term:  AC, LS, ES
Active:    Short Term:  CR, CW
Passive:   Long Term:  AT, EL
IV. Test Placement and Conditions (19 questions)
Variation: diurnal, seasonal, spatial, weather-related, occupant-related
Placement: level, room, location, how many
Minimum distances
Closed House Conditions
When required?  When recommended?
Requirements for Closed House Conditions
Notifying occupants
Interference/tampering: detecting, avoiding
Test invalidation
Data reported to lab with test kit
EPA Protocol for real estate transactions 
Interpretation of results
Measurement error /uncertainty
Large buildings, schools
(Recommended) Radon-in-water sampling
V.  Mitigation (5 questions)
Mitigation strategies: basics
      Radon from soil:
Soil depressurization: greatly reduces radon entry into house
Ventilation: dilutes radon that has entered the house
Other: sealing - usually doesn't work by itself
      Radon from water:
GAC filtration
Comparative performance and costs
Difficult situations
Don't offer mitigation strategies, let mitigators determine strategies
All houses can be fixed - cost is the issue
Radon resistant new construction
Post-mitigation testing, system monitoring, and maintenance
VI. Relation with Client (9 questions)
Dialogue with client
Risk communication
Interpretation of results for client
Based on radon test results, what should be done next? 
Do nothing, retest, or call mitigator(s)
If unusually high radon concentrations, urge client to call EPA or state for advice
What follow-up is required?
Real estate transaction
Re-test when?
Who pays for mitigation?
Negotiation and escrow possibilities
VII. Relation with Laboratory (5 questions)
Choosing lab
Levels of service
Division of responsibilities
Quality assurance responsibilities
Blanks, duplicates, spikes, calibrations
Quality assurance plan
VIII. Role of Government (5 questions) 
Federal: EPA
States: unregulated and regulated
Regional review of state laws
Real estate disclosure laws
Radon outreach programs
EPA Publications:
     Citizen's Guide to Radon
     Consumer's Guide to Radon Reduction
     Home Buyers and Sellers Guide to Radon
IX. Tester's Health and Safety, Professional Conduct, and Ethics (3 questions)
Testing in houses with known high radon concentrations
Professional Conduct
X.  Additional Courses, Continuing Education, and Credentials (2 questions)
Advanced measurement methods
Analytical services and quality assurance
Radon in water
Radon mitigation standards; and inspecting mitigation systems
Video courses
AARST programs
NRSB Certification
Other Certification Programs