title: Mitigation of the effective dose of radon decay products through the use of an air cleaner in a dwelling in Okinawa, Japan.
abstract: Field measurements were conducted to assess the effects of an air cleaner on radon mitigation in a dwelling with a high radon concentration in Okinawa, Japan. The measurements included indoor radon concentration, individual radon progeny concentration, equilibrium equivalent concentration of radon (EECRn), unattached fraction, and size distribution of aerosol-attached radon progeny. These measurements were conducted in a 74 m(3) room with/without the use of an air cleaner. The results showed that the mean radon concentration during the measurement was quite high (301 Bq m(-3)). The operation of air cleaner decreased the radon progeny activity concentration, EECRn and equilibrium factor by 33%, 57% and 71%, respectively, whereas the unattached fraction increased by 174%. In addition, the activity concentration of attached radon progeny in the accumulation mode (50-2000 nm) was obviously deceased by 42%, when the air cleaner was operated. According to dosimetric calculations, the operation of air cleaner reduced the effective dose due to radon progeny by about 50%.
authors.affiliation: Department of Nuclear Technology, Faculty of Engineering, Chulalongkorn University, Payathai Road, Patumwan, Bangkok 10330, Thailand.
authors.forename: Chutima
authors.initials: C
authors.lastname: Kranrod
authors.forename: Shinji
authors.initials: S
authors.lastname: Tokonami
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Ishikawa
authors.forename: Atsuyuki
authors.initials: A
authors.lastname: Sorimachi
authors.forename: Miroslaw
authors.initials: M
authors.lastname: Janik
authors.forename: Reina
authors.initials: R
authors.lastname: Shingaki
authors.forename: Masahide
authors.initials: M
authors.lastname: Furukawa
authors.forename: Supitcha
authors.initials: S
authors.lastname: Chanyotha
authors.forename: Nares
authors.initials: N
authors.lastname: Chankow