Radon Measurements in Multifamily Buildings


Radon Measurements Multifamily Buildings ANSI/AARST


Radon is a chemically-unreactive inert gas, but it is also highly radioactive. Two radon isotopes, Rn-222 and Rn-220, are found in significant concentrations in the human environment, forming in the decay chain of other radioactive elements. The alarming truth, when it comes to radon, is that the radioactive gas derives simply from soil gas, following the breakdown of uranium in the soil. This means that many people maintain airborne contact with the carcinogenic element.

In fact, radon causes 21,000 lung cancer deaths in the United States every year, being second only to smoking as the main cause of the terminal illness. Continuous exposure at a level high enough to contribute to these fatalities occurs after radon and its decay products remain inside a building, in which it enters through cracks in the slabs and walls, the expansion joints between floor and walls, porous concrete block walls, open sump pits, crawlspaces, and openings around utility penetrations.

According to the EPA, the concentration of radon in the air within a building should be reduced below 4 pCi/L (picocuries per liter), an amount that nearly 1 out of every 15 homes in the United States are estimated to exceed. Since radon is colorless, odorless, and tasteless, the only way to detect the incredibly-harmful radioactive chemical is through testing.

Radon testing varies based on the specific type of residence in which individuals live, and the appropriate testing procedures should be pursued for single dwellings, multi-use dwellings, and multifamily buildings, as the homes bear differences in structure and purpose. For multifamily buildings, ANSI/AARST MAMF-2017 - Protocol for Conducting Measurements of Radon and Radon Decay Products in Multifamily Buildings offers guidance for conducting measurements to identify locations that have elevated radon concentrations.


ANSI/AARST MAMF-2017 Radon Measurements


The ANSI/AARST MAMF-2017 standard can be used to determine, through repeatable and reliable tests, if mitigation is necessary in order to protect current or future occupants. It addresses the following radon measurements:

  1. “in buildings having more than one attached dwelling or other occupied unit under the same ownership or designated maintenance or management authority”
  2. “in buildings or structures, or a portion thereof that are used, for example, as apartment houses, dormitories, military congregate residences, fraternities and sororities, nontransient boarding houses, hotels, convents, monasteries, motels, and live/work units”
  3. “in multifamily structures that can include those with shared ownership or maintenance such as co-op units, townhouses, condominiums or vacation timeshare properties”
  4. “in multifamily structures, whether conducted for nonreal estate purposes or when associated with a real estate transaction”

ANSI/AARST MAMF-2017 covers preparations for the measurements, requirements for protocol, quality control, and the testing procedures themselves for assessing radon concentrations.

It is also important to note that, while the EPA’s radon action level is 4 pCi/L, any exposure to the element creates some danger. Some buildings containing radon concentrations under this value may even benefit by having those concentrations lowered through mitigation.

ANSI/AARST MAMF-2017 was written and published by the American Association of Radon Scientists and Technologists (AARST), an ANSI-accredited standards-developing organization. This non-profit, member-based organization is, as stated in AARST’s mission “dedicated to the highest standard of excellence and ethical performance of radon measurement, radon mitigation and transfer of radon information for the benefit of members, consumers and the public at large.”

Other AARST standards for radon consideration in home design are focused on testing for radon in single family dwellings, schools, and large buildings, as well as mitigating the presence of radon in new buildings and reducing radon activity in existing structures.

ANSI/AARST MAMF-2017 - Protocol for Conducting Measurements of Radon and Radon Decay Products in Multifamily Buildings is available on the ANSI Webstore.
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