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 11 Table 3.8 Requirements for Test Locations Within a Room Detectors shall be located NOT less than: 3 feet (90 cm) from exterior doors and windows or other potential openings to the outdoors. 20 inches (50 cm) above the floor. 1 foot (30 cm) from the exterior wall of the building. 1 foot (30 cm) below the ceiling. 4 inches (10 cm) from other test detectors and objects or surfaces that are above or to the side of the detector. Exception: Less than 4 inches (10 cm) is permitted for detectors that are not affected by close proximity to other objects. Confirm manufacturer or laboratory requirements or recommendations prior to exercising this exception. Side-by-side detectors Detectors are to be not more than 8 inches (20 cm) from each other when seeking to use the average test result of two side-by- side detectors for QC checks and mitigation decisions. Where not easily disturbed Informative Advisory —Select a position within the room where the detector(s) will not likely be disturbed, moved or have their performance altered during the measurement period. Detectors shall NOT be located: — inside closets, cabinets, drawers, sumps, crawl spaces or nooks in the building foundation. — near heat sources, such as on appliances, radiators, fireplaces or in direct sunlight. — near drafts caused by fans or heating and air conditioning vents or within enclosed areas of high air velocity such as mechanical/furnace closets. — within enclosed areas that accumulate high humidity, such as bathrooms, laundry rooms and kitchens that are isolated by partitions and doors from adjoining less humid areas. Exception: Where regularly occupied by workers for essential tasks, such as for cafeteria food preparation. Testing in such locations requires detector types that are virtually unaffected by high humidity which is to be confirmed by the manufacturer or laboratory prior to exercising this exception. Informative Advisory —Avoid placing detectors on or near objects that may produce radiation such as natural stone, rock collections, granite counter tops, hearths and slate pool tables.