Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/23533
Title: Using the real-time radon-222 profile to quantify the specific radon production rate in an air-conditioned building
Authors: Tung, TCW
Burnett, J
Chan, DWT
Keywords: Building material
Heating, ventilation and air-conditioning system
Specific radon production rate
Ventilation
Issue Date: 2006
Publisher: SAGE Publications
Source: Indoor and built environment, 2006, v. 15, no. 5, p. 483-493 How to cite?
Journal: Indoor and built environment 
Abstract: The real-time indoor and outdoor radon-222 profiles on the fourth floor of a university library were measured through five consecutive days, with the Heating, Ventilating and Air Conditioning (HVAC) system operating on part load. The premises were served by a main air-handling unit (AHU-1) and a subordinate unit (AHU-2) of the HVAC system, but AHU-2 was shut down for maintenance. It required full operation of AHU-1 for 1.7 h to reduce the radon concentration from the overnight peak down to the recommended action level (200 Bq·m-3). Clear characteristics of indoor radon profiles were observed, with the diurnal variations of indoor radon concentrations strongly coupled to the operation schedule of AHU-1. The specific radon production (value-Φ) of the site could be quantified from the characteristic profiles. This can be used to investigate the radon emission rate of a site, as well as to simulate the indoor radon concentrations at different ventilation rates. The value-Φ was 21.0 Bq h-1·-m-3, with a standard deviation of 0.6 Bq h-1·m-3. Furthermore, it was found that a morning purge, by the fresh air intake fan operating for 2h before library opening hours, could not effectively remove the overnight accumulation of the pollutant.
URI: http://hdl.handle.net/10397/23533
ISSN: 1420-326X
EISSN: 1423-0070
DOI: 10.1177/1420326X06069176
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