NRSB RMT study guide
NRSB RMT · Work through your exam, one topic at a time.
The NRSB Radon Measurement Technician (RMT) certification is a credential issued by the National Radon Safety Board to people who have been trained and certified in the fundamentals of radon testing. It suits technicians who deploy and retrieve measurement devices in homes and buildings under a measurement protocol, and who want third-party recognition of that training alongside any state radon program requirements. This page is an independent study aid for the RMT exam; it is not affiliated with or endorsed by NRSB. The RMT exam is delivered online and available 24 x 7. It consists of 75 multiple choice questions, the examinee has 1.5 hours to complete it, the passing grade is 70%, and it costs 120. Certification itself is separate from the exam: candidates must first take and pass an NRSB-approved 8-hour Initial Measurement Course, then pass the exam, then submit the Initial Measurement Technician Application with the exam score report, the course completion certificate, and any required device documentation, plus the certification fee of 125 for 1 year or $200 for two years. Topics on this exam: Radon measurement fundamentals and testing practice (RMT content domain; weights not published by NRSB). The NRSB RMT study guide has 1 section and about 388 words.
01Radon Measurement Fundamentals and Testing Practice
The RMT measurement domain tests radon fundamentals, device selection, closed-house testing, placement, QA/QC, and reporting. Expect practical items: which device fits the duration and site, whether a result is valid, and how to convert and interpret it. Radon-222 is a noble gas with a 3.82-day half-life. It decays by alpha emission; the short-lived progeny (Po-218, Pb-214, Bi-214, Po-214) deliver most of the lung dose.
388 words, about 2 minMore study resources for NRSB RMT
- Practice questionsIn radon measurement, what does the term 'working level' (WL) describe?
- FlashcardsRadon-222 half-life. Because the gas decays quickly, a measurement reflects only the exposure period, and short-term tests must be deployed and retrieved on a tightly controlled schedule.
- Cheat sheetRadon-222 is a noble gas produced in the uranium-238 decay chain (Ra-226 → Rn-222, half-life 3.82 days); its short-lived progeny Po-218, Pb-214, Bi-214, and Po-214 emit the alpha and gamma radiation most detectors count.
- Key termsRadon (Rn-222). A colorless, odorless, radioactive noble gas produced by the decay of radium-226; it seeps from soil and rock into buildings and is the leading environmental cause of lung cancer after smoking.
- Study planDefine radon and explain its radioactive decay chain from uranium-238 through radium-226 to radon-222 and its short-lived progeny, listing the half-lives of each step.
- Common mistakesCandidates import the EPA 4 pCi/L 'action level' framing from consumer literature and confuse it with a regulatory limit, then pick the most aggressive answer offered.
- Exam-day guideBring the original, unexpired ID (driver's license, passport, or state ID) whose name exactly matches your registration.