MALB_2014 with 1-21 Revisions

Conducting Measurements of Radon and Radon ANSI/AARST MALB-2014 with 1/21 Revisions Decay Products in Schools and Large Buildings 37 9.36 Mitigation System A system designed to reduce radon concentrations in the indoor air of a building. 9.37 Multifamily Building Buildings having more than one attached dwelling or other occupied unit under the same ownership or designated maintenance or management authority. 9.38 Multi-Zone Systems Independent systems and controls for different areas within the same dwelling, room or unique sector . See Exhibit 6, Group 2. 9.39 Normal occupiable Indoor temperatures of between 65˚and 80˚ F (18˚ - 27˚ C). indoor temperatures 9.40 Normal Occupied The operational condition for the building or unique sector of the building that Operating Condition exists during the greatest amount of significantly occupied time. See “ Significantly occupied ” 9.41 Notice of Radon Written notices to inform occupants and facilitating staff about testing and Testing required test conditions associated the radon testing. 9.42 Occupied Any area of the building that is occupied on a regular basis for more than 4 hours a day. See “ Significantly occupied ” and “ Occupied Weeks ” 9.43 Occupied Work or Those weeks that do not include vacation days such as national or religious School Weeks holidays, winter breaks or similar weeks where test conditions do not represent normal occupied operating conditions for the building. See “Normal Occupied Operating Condition” , “Occupied” and “Significantly Occupied” 9.44 Office Blanks These detectors serve to reveal any unexpected exposures that might result from storage or handling. 9.45 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. 9.46 Performance Testing A test procedure to characterize the degree of general effectiveness for mitigation ( Mitigation) efforts within a specific area of a building. 9.47 Picocurie per Liter A unit of concentration of radioactivity corresponding to 0.037 decays per second (pCi/L) or 2.22 decays per minute in a liter of air or water. 1 pCi/L = 37 becquerels per cubic meter ( Bq/m 3 ). 9.48 Qualified Measurement An individual that has demonstrated a minimum degree of appropriate technical Professional knowledge and skills specific to radon measurement procedures in homes with additional knowledge needed when testing multifamily buildings and schools or other large buildings. 9.49 Quality Assurance (QA) A complete program designed to produce results that are valid; scientifically defensible; and of known precision, bias, and accuracy, including planning, documentation, and quality control activities. 9.50 Quality Control (QC) The system of activities to ensure a quality product, including measurements made to ensure and monitor data quality. For radon measurement devices includes calibrations and background, duplicate , blank and spiked measurements ; inter- laboratory comparisons; audits; and other control activities. 9.51 Radon (Rn) A colorless, odorless, naturally occurring, radioactive, inert, gaseous element formed by radioactive decay of radium (Ra-226) atoms. The atomic number is 86.