MAH_2019

Protocol for Conducting Measurements of ANSI/AARST MAH 2019 Radon and Radon Decay Products in Homes 19 10.0 DEFINITION OF TERMS 10.1 Action Level A threshold for when mitigation of exposure to harmful elements is recommended or required. 10.2 Becquerel per Cubic A unit of radioactivity representing one disintegration per second per cubic Meter (Bq/m ³ ) meter: 1 Bq/m 3 (0.027 pCi/L). 10.3 Blank Measurements Blanks are detectors deployed to verify and document the absence of effects on the measurement resulting from sources other than the air being tested. Since blanks are not exposed (i.e., not left open to permit radon to enter the detector), their measurement value should be below the minimum detectable concentration of the measurement system. 10.4 Client The individual(s) or parties who hire(s) or pay(s) for radon test services. 10.5 Collocated Two or more simultaneous measurements in the same location, or side-by-side. 10.6 Continuous Radon A CRM is an electronic device that is capable of automatically recording a Monitor (CRM) retrievable time series of numeric measurements of radon concentration averaged over time intervals of 1 hour or less. 10.7 Crawl Space An open area beneath part or all of the livable space of a dwelling that typically has either a concrete slab or dirt floor. The dirt floor may be covered with gravel or a membrane. The crawl space can have an open height of a few inches to several feet. The crawl space can be storage space but is not living space. 10.8 Duplicates and Duplicates and comparison checks are pairs of detectors or monitors deployed in Comparison Checks the same location, side by side for the same measurement period. Their purpose of is to evaluate precision or agreement between detectors. 10.9 Extended Testing An initial short-term test which, if a radon concentration is found to be elevated, is followed by a short- or long-term test. The decision to mitigate is based on the average of two short-term tests or the result of the long-term test. 10.10 Mitigation Efforts to reduce radon concentrations in the indoor air of a building. 10.11 Mitigation System A system designed to reduce radon concentrations in the indoor air of a building. 10.12 Multifamily Building A building with more than three attached dwellings. 10.13 Normal occupiable Indoor temperatures of between 65˚and 80˚ F (18˚ - 27˚ C). temperatures 10.14 Passive Device Radon measurement detectors or systems that collect a time-weighted average and do not provide hourly readings. Passive detectors include electret ion chambers; activated charcoal kits; liquid scintillation vials; alpha-track detectors; and continuous monitoring devices that are not set to or capable of automatically recording a retrievable time series of 1 hour measurements. 10.15 Picocurie per Liter A unit of concentration of radioactivity corresponding to 0.037 decays per (pCi/L) second or 2.22 decays per minute in a liter of air or water. 1 pCi/L = 37 becquerels per cubic meter (Bq/m 3 ). 10.16 Qualified Measurement An individual that has demonstrated a minimum degree of appropriate Professional technical knowledge and skills specific to radon measurement in homes: a) as established by certification requirements of the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB); and/or