title: The distribution of lifetime cumulative exposures to radon for California residents.
abstract: The distribution of individual lifetime exposures to radon was estimated using data from studies on radon concentrations, mobility, and time-activity patterns in the state of California. The distributions of radon concentrations in various geographic regions were obtained from the results of year-long radon measurements of 310 residences. The mobility patterns were acquired through a survey of the moving histories of the members of 507 households. The indoor and outdoor time-activity data were collected for 1,780 individuals in 1,596 households. Based on these data, a computer simulation technique was used to estimate the distribution of radon exposures with a parametric (lognormal model) and a nonparametric approach (bootstrap method). The estimated average lifetime exposure for radon was 2,448 Bq.m-3.yr for the lognormal model and 2,487 Bq.m-3.yr for the bootstrap method. The standard deviation was 1,130 and 1,145 Bq.m-3.yr respectively. Assuming no move over the lifetime, the estimated average lifetime exposure to radon was 2,052 Bq.m-3.yr for the lognormal model and 2,078 Bq.m-3.yr for the bootstrap method, while the standard deviation increased to 1,378 Bq.m-3.yr for the lognormal model and 1,514 Bq.m-3.yr for the bootstrap method.
authors.affiliation: Air & Industrial Hygiene Laboratory, California Department of Health Services, Berkeley 94704.
authors.forename: K S
authors.initials: KS
authors.lastname: Liu
authors.forename: Y L
authors.initials: YL
authors.lastname: Chang
authors.forename: S B
authors.initials: SB
authors.lastname: Hayward
authors.forename: A J
authors.initials: AJ
authors.lastname: Gadgil
authors.forename: A V
authors.initials: AV
authors.lastname: Nero
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002140:California; D002648:Child; D002675:Child, Preschool; D003198:Computer Simulation; D004781:Environmental Exposure; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D009010:Monte Carlo Method; D011157:Population Dynamics; D011834:Radiation Monitoring; D011886:Radon / Q000032:analysis*
chemical_list: D011886:Radon