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EPA/ANSI-AARST
United States
Reference Level: 148 Bq/m³
Overview
Scope: All buildings
Authority: U.S. Environmental Protection Agency (EPA)
Legal Reference: EPA 402/K-12/002; ANSI/AARST MAH-2023 (homes), MA-MFLB-2023 (buildings), MS-QA-2023
Measurement Protocol
Duration: 0.07-3 months
Detector Type: Activated charcoal, electrets, track-etch, continuous monitors
Measurement Season: Short test: 2-90 days closed-house; Long test: >90 days
Short-Term Test Option
2-90 days short-term test available (12h closed-house conditions)
Confirmation test required if ≥148 Bq/m³
Laboratory Requirements
Accreditation: Devices listed by NRPP (National Radon Proficiency Program) or NRSB
QA/QC Requirements
- • 10% duplicate samples
- • 5% blank samples
- • 3% spike samples
Alternative Units
Action Level: 4 pCi/L (≈148 Bq/m³)
1 pCi/L ≈ 37 Bq/m³