title: Sensitivity of LR115 detector in diffusion chamber to 222Rn in the presence of 220Rn.
abstract: Determination has been made of the sensitivity of LR115 type 2-track detectors (in units of m) to 222Rn, measured in the presence of 220Rn. Measurements have been made by means of a widely used diffusion chamber while Monte Carlo simulations have also been conducted. The experimentally derived sensitivities for 222Rn and 220Rn were found to be 0.470+/-0.022 and 0.486+/-0.042 m, respectively. For Monte Carlo simulations, the sensitivities to 222Rn gas were found to range from 0.618 x 10(-2) m (assuming that all 218Po progeny decay before deposition onto the internal walls of the diffusion chamber) to 0.405 x 10(-2) m (assuming that all 215Po progeny are deposited on the internal walls of the same containment vessel before decaying). The sensitivity to 220Rn gas of 0.465 x 10(-2) m found from Monte Carlo simulations agrees to within uncertainty with experimental findings. The experimentally derived sensitivity value for 222Rn indicates that 30% of the 218Po progeny decay before deposition onto the internal walls of the diffusion chamber.
authors.affiliation: Department of Physics and Materials Science, City University of Hong Kong, Kowloon Tong.
authors.forename: V S Y
authors.initials: VS
authors.lastname: Koo
authors.forename: C W Y
authors.initials: CW
authors.lastname: Yip
authors.forename: J P Y
authors.initials: JP
authors.lastname: Ho
authors.forename: D
authors.initials: D
authors.lastname: Nikezic
authors.forename: K N
authors.initials: KN
authors.lastname: Yu
mesh_terms: D003198:Computer Simulation; D004058:Diffusion; D009010:Monte Carlo Method; D011834:Radiation Monitoring / Q000379:methods; D011886:Radon / Q000032:analysis*; D017687:Radon Daughters / Q000032:analysis*; D012680:Sensitivity and Specificity
chemical_list: D017687:Radon Daughters; D011886:Radon