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NRSB RMS study materials
NRSB RMS study resources

NRSB RMS study guide

NRSB RMS · Work through your exam, one topic at a time.

The Radon Measurement Specialist (RMS) credential is issued by the National Radon Safety Board (NRSB), an independent certifying body that has been certifying radon professionals for over 20 years. RMS certification is formal recognition of professional excellence based on qualifications, high ethical standards, and continuing education in radon services. It is aimed at individuals who design, place, and interpret radon measurements - as distinct from the Radon Measurement Technician (RMT) and the Radon Mitigation Specialist (RRS) credentials - and it carries device-specific obligations: specialists using continuous radon monitors (CRMs) or electret ion devices must submit calibration reports for every device used, complete a proficiency test, and submit copies of the reports given to customers. The NRSB RMS Exam is delivered online and available 24 x 7, consists of 100 multiple choice questions, allows the examinee 2 hours to complete it, requires a passing grade of 70%, and costs 120. Before sitting the exam, candidates must take and pass an NRSB-approved 16-hour Initial Measurement Course. The NRSB publishes a free Certification Exams Study Guide, and the NRSB recognizes ANSI/AARST radon standards in addition to the previously recognized EPA and ASTM standards; certificate holders must follow the standards recognized by the state in which they do business, and their QA plan must list the standards being followed. Topics on this exam: Radon measurement (RMS exam content). The NRSB RMS study guide has 1 section and about 467 words.

01

Radon Measurement: Physics, Protocols, QC, and Interpretation

This domain is the measurement core of the NRSB Radon Measurement Specialist exam. It tests whether you understand what a radon number actually represents, how devices must be deployed and controlled while deployed, and how to interpret a result into a defensible recommendation for a client. Radon-222 is a noble gas with a 3.82-day half-life, produced from radium-226 in soil and rock. Its short-lived progeny (Po-218, Pb-214, Bi-214, Po-214) are the alpha emitters that deliver dose.

467 words, about 2 min

More study resources for NRSB RMS

  • Practice questionsUnder the standard short-term radon test protocol used in the United States, what is the minimum recommended closed-building period before and during a test lasting 2 to 90 days?
  • FlashcardsRadon-222 half-life. Radon-222 has a half-life of 3.82 days and decays by alpha emission to polonium-218.
  • Cheat sheetRadon-222 is a noble gas produced by alpha decay of radium-226; its half-life is 3.82 days, and it decays by alpha emission to polonium-218.
  • Key termsRadon. A colorless, odorless, radioactive gas produced by the decay of radium-226, which itself comes from uranium-238 in soil and rock.
  • Study planDefine radon and distinguish it from radon progeny (decay products), stating the units used for each (Bq/m³, pCi/L, working level).
  • Common mistakesCandidates memorize '12 hours' from study summaries and then apply it to the wrong clock anchor, or assume the device placement itself starts the clock.
  • Exam-day guideBring the original, unexpired ID with a name matching your registration exactly.