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 36 a STAR . Ambient gamma rays also ionize air inside the chamber, and the effects of ambient gamma radiation must be taken into account. Different electret sensitivities and chamber sizes can be used in combination to measure a range of radon concentration ranging from 2 days to 1 year. The EIC QA requirements apply to all combinations of electrets and chambers used to measure radon concentration in ambient air. 9.21 Extended Testing An initial test where, if a radon concentration is found to be elevated, a follow-up confirmation test is conducted. Alternatively, initial tests conducted over an extended period of time, such as more than 90 days 9.22 Facilitating staff Individuals who work at the property being tested or work for property owners or managers such as building supervisors, maintenance staff or office managers. 9.23 Field Blanks These detectors serve to reveal any unexpected exposures that might result onsite or from handling procedures. 9.24 Follow-up Test Procedures for radon measurement events such as confirmation testing to verify Procedures initial test results, post- mitigation testing and other measurements conducted to better evaluate radon hazards. 9.25 Ground-Contact Indoor locations that are habitable, or could be made habitable, and: a) have floors or walls in contact with ground, or b) are closest to ground, such as rooms over a crawl space , utility tunnel or parking garage. 9.26 HAC Systems Heating and cooling (air conditioning) systems that are not designed to also supply fresh air ventilation. HAC systems are common to single-family residences. 9.27 High-rise Structures Buildings containing one or more occupied floors located higher than 75 feet (23 m) above the lowest level. 9.28 HVAC Setback HVAC “setback” is normally the automated or manual manipulation of system controls to vary operation of heating, cooling and ventilation systems between occupied periods as compared to unoccupied periods. 9.29 HVAC System Heating and cooling (air conditioning) systems that are additionally capable of supplying outdoor air ventilation. If systems do not supply outdoor air ventilation, they are more technically referred to as HAC systems. 9.30 Intended to be Locations where there are plans to occupy rooms even though unoccupied at the Occupied time of the testing procedure. Examples include, vacant locations being leased or sold and locations where renovation or repurposing is planned. 9.31 Lab-transit Blanks These detectors serve both to evaluate the quality of the laboratory and to look for unexpected exposures that might result from shipping or handling 9.32 Long-Term Test Device A radon measurement device or detector that is capable of producing a time weighted average for radon concentrations for test periods that may extend for weeks, months or a year. 9.33 Lot The term “lot” refers to bundled sets of unexposed detectors received from manufacturers or other sources at local office(s) as distinguished by the date of purchase. 9.34 Measurement (See Qualified Measurement Professional ) Professional 9.35 Mitigation Efforts to reduce radon concentrations in the indoor air of a building.