title: Air conditioning impact on the dynamics of radon and its daughters concentration.
abstract: Radon and its decay products are harmful pollutants present in indoor air and are responsible for the majority of the effective dose due to ionising radiation that people are naturally exposed to. The paper presents the results of the series of measurements of radon and its progeny (in unattached and attached fractions) as well as indoor air parameters: temperature, relative humidity, number and mass concentrations of fine aerosol particles. The measurements were carried out in the auditorium (lecture hall), which is an indoor air quality laboratory, in controlled conditions during two periods of time: when air conditioning (AC) was switched off (unoccupied auditorium) and when it was switched on (auditorium in normal use). The significant influence of AC and of students' presence on the dynamics of radon and its progeny was confirmed. A decrease in the mean value of radon and its attached progeny was found when AC was working. The mean value of radon equilibrium factor F was also lower when AC was working (0.49) than when it was off (0.61). The linear correlations were found between attached radon progeny concentration and particle number and mass concentration only when the AC was switched off. This research is being conducted with the aim to study the variability of radon equilibrium factor F which is essential to determine the effective dose due to radon and its progeny inhalation.
authors.affiliation: Institute of Nuclear Physics PAN, Radzikowskiego 152, Kraków 31-342, Poland krzysztof.kozak@ifj.edu.pl.
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Kozak
authors.affiliation: Institute of Nuclear Physics PAN, Radzikowskiego 152, Kraków 31-342, Poland.
authors.forename: Dominik
authors.initials: D
authors.lastname: Grządziel
authors.affiliation: Lublin University of Technology, Nadbystrzycka 40B, Lublin 20-618, Poland.
authors.forename: Bernard
authors.initials: B
authors.lastname: Połednik
authors.affiliation: Institute of Nuclear Physics PAN, Radzikowskiego 152, Kraków 31-342, Poland.
authors.forename: Jadwiga
authors.initials: J
authors.lastname: Mazur
authors.affiliation: Lublin University of Technology, Nadbystrzycka 40B, Lublin 20-618, Poland.
authors.forename: Marzenna R
authors.initials: MR
authors.lastname: Dudzińska
authors.affiliation: Institute of Nuclear Physics PAN, Radzikowskiego 152, Kraków 31-342, Poland.
authors.forename: Mariusz
authors.initials: M
authors.lastname: Mroczek
mesh_terms: D000389:Air Conditioning; D000396:Air Pollutants, Radioactive / Q000009:adverse effects / Q000032:analysis*; D016902:Air Pollution, Indoor / Q000009:adverse effects / Q000032:analysis*; D006801:Humans; D011044:Poland; D011834:Radiation Monitoring; D011886:Radon / Q000009:adverse effects / Q000032:analysis*; D017687:Radon Daughters / Q000009:adverse effects / Q000032:analysis*; D012621:Seasons; D014495:Universities
chemical_list: D000396:Air Pollutants, Radioactive; D017687:Radon Daughters; D011886:Radon