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Radon Screening Test Instructions

The activated charcoal canister is a short-term measurement of the highest potential concentration of radon to which you may be exposed. The canister consists of activated charcoal which is protected by a screen filter. During the exposure period, radon gas particles will attach to the surface of the activated charcoal. Since this device is passive, no external source of power is needed. The canister is closed after a 48-hour period and returned to Micro Air, Inc. for analysis.

The following instructions must be followed carefully to assure accurate results. These instructions reflect the EPA recommended measurement procedures for this method. The canister should be open for measurement for a 48-hour period only. Do not begin the test if you are unable to be home at the end of the period. After analysis, the radon level is reported as picocuries per liter (pCi/l) of air. EPA guidelines suggest that levels at or above 4 pCi/l are unsafe.

Measurement Procedures:

Windows and doors should be kept closed 12 hours before and during measurement (except normal entry and exit). Be sure all outside air fans and ventilation systems are not operating (e.g. attic fans); however, air conditioning systems that recirculate inside air are all right to operate. The canister should be placed in the lowest lived-in level of the house. This includes a basement that can be used as a recreation room, bedroom, or playroom.

Do not place the canister in a crawl space, sump pit, garage, kitchen, laundry room, bathroom, or on a pool table. Within a selected room, place the canister on a table or shelf at least two (2) feet above the floor and at least one (1) foot away from outside walls or any drafty areas (e.g. open doors, windows, fireplaces, ceiling fans, etc.) Do not set in a closed area such as a closet, drawer, or cupboard. Do not begin the test if storms or high winds (+30mph) are predicted. This may adversely affect the results.

STEP 1: Remove tape from around canister. Save tape to reseal canister by sticking around one half of canister.

STEP 2: Remove lid from canister. Place the lower half of the canister, with the screen side up toward the open air, about 2 feet above floor level.

STEP 3: Fill in the start date and time on the label of the canister.

STEP 4: After a minimum of 48 hours and as close to 48 hours as possible, replace the lid on the canister and reseal with the tape.

STEP 5: Fill in the stop date and time on the label. Place the canister in the original box, and either mail it back to Micro Air, Inc. within 24 hours by First Class mail, or drop it off at our laboratory.