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 2 2.0 BEFORE YOU TEST 2.1 Which Buildings Should be Tested? Informative Advisory Any building on any parcel of land can have a radon problem. Testing is the only way to know. Radon concentrations cannot be predicted based on national, state or local radon survey maps or neighborhood radon measurements. 2.2 When to Test? 2.2.1 Where occupied both day and night Radon testing is permitted at any time of the year for residential dwellings or living units and non- residential locations that are significantly occupied both day and night. Informative Advisory— Measurements more likely to provide an accurate reflection of occupant exposure to radon hazards are measurements conducted under conditions that most closely align to the normal building operating condition that prevails during the greatest amount of time each year. 2.2.2 Where not occupied both day and night For buildings or portions of buildings that are non-residential and not significantly occupied both day and night, the measurements shall be conducted at a time that is representative of normal occupied building operating conditions, as defined in Section 2.7.2 . Exception: It shall be permitted to test at any time of the year when the purpose of the testing demands timeliness, such as a business transaction or health concern demands. 2.3 Test Devices 2.3.1 Approved test devices required All test devices used for determining if mitigation is warranted shall be devices that are listed by one of the following authorities for having proven to meet minimum quality requirements: a) the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB); or b) as required by local jurisdictions that have a program for evaluating and approving devices. 2.3.2 Device instructions and appropriateness Radon measurement devices shall be used in compliance with both this standard and instructions provided by the manufacturer that relate to device-specific needs. Note— Section CG-3 in the attached Companion Guidance provides descriptions of test devices. 2.3.3 Test device types (defined) When the following terms are used to describe radon test devices , the following definitions shall apply: a) The term “ Passive Device ” refers to those that collect a time-weighted average and do not provide hourly readings. b) The term “Continuous Monitor” refers to monitors that are capable of automatically recording a retrievable time series of numeric measurements of radon concentration averaged over time intervals of 1 hour or less and can be recalibrated periodically. If a device is not capable of these functions or is not set to record readings each hour, it is functioning as a passive device and is not considered a continuous monitor under this protocol.