The Meridian Certification Press Study Guide for Radon Measurement and Mitigation Professional Certification is a comprehensive, independently published resource for candidates preparing for credentials administered by the National Radon Proficiency Program (NRPP) or state-level radon certification agencies. At 147 pages, this guide integrates the physics of radon generation and transport, building science principles, measurement protocols, mitigation system design, and regulatory compliance knowledge that professionals must command to earn their credential and protect public health. This study guide is not affiliated with or endorsed by NRPP, AARST, or any state radon program.

The guide is anchored by Part I: Foundations of Radon Science and Regulation, which builds the technical knowledge base that all subsequent chapters depend upon. Chapter 1 covers radon's origin, properties, and the uranium-238 decay chain in rigorous detail, addressing where radon comes from in geological formations, its physical and chemical properties as a noble gas, the health-critical role of radon progeny (polonium-218 and polonium-214), units of measurement including picocuries per liter and becquerels per cubic meter, geographic variation driven by geology and soil characteristics, radon dissolved in groundwater, and the processes of emanation, transport, and exhalation from soil into the atmosphere and building interiors. The chapter concludes with the dynamic equilibrium model that governs indoor radon concentrations. Chapter 2 addresses radon entry pathways and building science, covering soil gas as the dominant source, the stack effect and its seasonal variation, mechanical and wind-driven pressure differentials, common entry points through cracks, joints, sumps, and utility penetrations, the radon risk profiles of different foundation types including basement, crawlspace, and slab-on-grade construction, diagnostic pressure measurement techniques using micromanometers, and the complex interactions between HVAC systems and radon entry dynamics. Subsequent parts of the guide address measurement device selection and deployment â " including continuous radon monitors, charcoal canisters, and alpha-track detectors â " quality assurance and quality control protocols, EPA measurement guidance, active sub-slab depressurization system design, passive and hybrid mitigation approaches, fan selection and sizing, system commissioning and post-mitigation testing, radon in water treatment, new construction radon-resistant techniques (RRNC), and the business and regulatory aspects of operating a radon services firm.

The guide includes practice examinations modeled on the NRPP certification test format, with detailed explanations referencing specific EPA protocols, AARST/ANSI standards, and building science principles. Appendices provide radon potential maps, a diagnostic decision tree for selecting mitigation approaches based on foundation type and pressure field results, a glossary of radon science and building science terminology, and reference tables for fan performance curves and system sizing calculations.

Passing the radon measurement or mitigation professional examination equips you for a satisfying and meaningful career protecting families from the second leading cause of lung cancer in the United States. Certified radon professionals serve homeowners, real estate transactions, schools, and commercial buildings, with demand driven by increasing public awareness, state licensing requirements, and real estate disclosure laws that ensure steady work across residential and commercial sectors.

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Radon Measurement/Mitigation Professional Study Guide 2026

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