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Key Facts: NRSB RMT Exam
75 questions
Exam Length (1.5 hours)
NRSB Digital Exam Information
70% (53/75)
Passing Score
NRSB RMT Exam Guidance
$120
Exam Fee (non-refundable)
NRSB
8 hours
Required Approved Training
NRSB Certification Requirements
4 pCi/L
EPA Radon Action Level
EPA Citizen's Guide to Radon
14 days
Retake Waiting Period
NRSB Digital Exam Information
4 CE credits/year
Renewal Requirement
NRSB Renewal Policy
The NRSB RMT exam certifies entry-level radon professionals — often home inspectors and field technicians — to place and retrieve radon test devices under the supervision of a certified Radon Measurement Specialist or Accredited Radon Laboratory. The virtual live-proctored exam (desktop or laptop only) has 75 single-best-answer questions in 1.5 hours; passing requires 70% (53 of 75), the fee is $120, failed attempts require a 14-day wait, and a pass is valid one year toward certification. The official curriculum weights placement and conditions most heavily (19 of 75 questions): lowest lived-in level, 20 inches above the floor, 3 feet from exterior doors/windows, 1 foot from exterior walls, and closed-building conditions starting 12 hours before tests shorter than 4 days. Other domains cover the radon decay chain and pCi/L-WL units, lung cancer risk and smoking synergy, device types (charcoal, electret, alpha track, CRM), mitigation basics, QA duplicates-blanks-spikes, EPA and state government roles, and ethics. Questions draw on current ANSI/AARST standards and EPA protocol documents. Certification requires 8 hours of approved training and renews with 4 CE credits per year.
Sample NRSB RMT Practice Questions
Try these sample questions to test your NRSB RMT exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1Radon-222, the isotope of primary concern in indoor air, is produced directly by the radioactive decay of which element?
2What is the approximate half-life of radon-222?
3Radon itself is a chemically inert noble gas. Why do its decay products (progeny) deliver most of the radiation dose to the lungs?
4One picocurie per liter (pCi/L) of radon is equal to approximately how many becquerels per cubic meter (Bq/m3)?
5Which statement best defines one Working Level (WL)?
6Using the EPA's assumed 50% equilibrium ratio between radon gas and its progeny, a progeny concentration of 0.02 WL corresponds to approximately what radon gas concentration?
7What is the EPA action level at which homeowners are advised to fix their homes for radon?
8The average outdoor (ambient) radon concentration in the United States is approximately:
9The national average indoor radon concentration in U.S. homes is approximately:
10Which mechanism is the dominant way radon from soil gas enters most houses with elevated levels?
About the NRSB RMT Exam
The NRSB Radon Measurement Technician (RMT) exam is the entry-level certification test of the National Radon Safety Board for professionals who place and retrieve radon measurement devices. Certified RMTs work under the supervision of an NRSB Radon Measurement Specialist or an NRSB Accredited Radon Laboratory within an active quality assurance program. The 75-question exam follows the NRSB course curriculum: radon science and units, health effects, test devices, placement and closed-building protocols, mitigation basics, client and laboratory relations, the role of government, and professional ethics. Candidates must first complete 8 hours of NRSB-approved classroom training, and a passing score is valid for one year toward certification.
Questions
75 scored questions
Time Limit
1.5 hours (90 minutes)
Passing Score
70% (at least 53 of 75 questions)
Exam Fee
$120 (non-refundable) (National Radon Safety Board (NRSB))
NRSB RMT Exam Content Outline
Basic Radon Science & Units
Uranium-radium-radon decay chain, radon-222 half-life (3.8 days), progeny, alpha/beta/gamma radiation, pCi/L, Bq/m3, WL and WLM units, typical indoor (1.3 pCi/L) and outdoor (0.4 pCi/L) levels, soil-gas entry and the stack effect
Health Effects of Radon
Progeny deposition and alpha damage to the lung, uranium miner studies and BEIR VI, ~21,000 annual U.S. lung cancer deaths, smoking synergy (62 vs 7 per 1,000 lifetime risk at 4 pCi/L), radon-in-water 10,000:1 transfer factor
Radon Test Methods & Devices
Passive vs active devices: activated charcoal (2-7 days), charcoal liquid scintillation, electret ion chambers (ES/EL), alpha track (91+ days), continuous radon and working level monitors, grab samples, short-term (2-90 day) vs long-term testing
Test Placement & Measurement Conditions
Lowest lived-in/occupiable level, 20-inch height, 3 ft from exterior doors/windows, 1 ft from exterior walls, closed-building conditions (12 hours before tests under 4 days), weather restrictions, real estate simultaneous/sequential protocols, interference and invalidation, schools and large buildings
Mitigation Basics & Post-Mitigation Testing
Active soil depressurization, why sealing alone fails, ventilation/HRV dilution, aeration and GAC for well water, U-tube manometer monitoring, retest no sooner than 24 hours and within 30 days of installation, radon-resistant new construction
Client & Laboratory Relations (QA)
Risk communication, confidentiality, follow-up testing decisions at and above 4 pCi/L, real estate negotiation and escrow, working under RMS/ARL supervision, QA plan with duplicates (~10%), field blanks (~5%), spikes (~3%), and calibration
Government, Ethics & Professional Practice
EPA guidance role, Indoor Radon Abatement Act of 1988 goal, state licensure and disclosure laws, EPA consumer publications, National Radon Action Month (January), occupational exposure, conflicts of interest, NRSB code of ethics and CE requirements
How to Pass the NRSB RMT Exam
What You Need to Know
- Passing score: 70% (at least 53 of 75 questions)
- Exam length: 75 questions
- Time limit: 1.5 hours (90 minutes)
- Exam fee: $120 (non-refundable)
Keys to Passing
- Complete 500+ practice questions
- Score 80%+ consistently before scheduling
- Focus on highest-weighted sections
- Use our AI tutor for tough concepts
NRSB RMT Study Tips from Top Performers
Frequently Asked Questions
How many questions are on the NRSB RMT exam and what score do I need to pass?
The RMT exam has 75 single-best-answer multiple-choice questions with a 1.5-hour time limit. You must score 70% or higher — at least 53 of 75 questions correct. A preliminary score is emailed at completion, with the final score following within 72 hours after audit review.
What are the prerequisites for taking the NRSB RMT exam?
You must complete eight hours of NRSB-approved classroom training covering the nature of radon, radon entry into buildings, health risks, occupational health and safety, measurement devices and techniques, and current radon protocols. After passing the exam, certification also requires adherence to the NRSB code of ethics.
How is the NRSB RMT exam administered?
It is a virtual live-proctored digital exam taken on a desktop or laptop computer only — mobile devices and most work computers are not permitted. You may use one piece of scrap paper plus on-screen tools (notepad, formula sheet, calculator). The $120 exam fee is non-refundable, and you cannot reschedule within 24 hours of your appointment.
What can an NRSB-certified Radon Measurement Technician legally do?
An RMT is qualified to place and retrieve radon measurement devices to collect radon data. This work must be performed in accordance with an active quality assurance program and under the supervision of an NRSB-certified Radon Measurement Specialist (RMS) or an NRSB Accredited Radon Laboratory (ARL). Independent measurement services require the higher RMS credential.
What happens if I fail the RMT exam?
You must wait 14 days before retesting and pay the $120 fee again, as all exam fees are non-refundable. When you pass, the result remains valid for one year toward NRSB certification.
What topics dominate the RMT exam?
Test placement and conditions is the largest section (19 of 75 questions): device placement distances, closed-building conditions, interference, real estate protocols, and result interpretation. Basic concepts, health effects, test methods, and client relations carry 9 questions each, with smaller sections on mitigation, laboratory QA, government roles, and ethics.
How do I keep the RMT certification current?
NRSB certification costs $125 per year (or $200 for two years) and requires 4 approved continuing education credits annually. Technicians certified with NRSB for 10 or more years may renew with 2 CE credits for one year or 4 CE credits for two years.