Radon progeny dose conversion coefficients for Chinese males and females

The airway dimensions for Caucasian males have been scaled by multiplying b y factors 0.95 and 0.88 to give those for Chinese males and females, respec tively. Employing the most recent data on physical and biological parameter s, the radiation doses to the basal and secretory cells due to cc particles from Po-218 and Po-214, homogeneously distributed in the mucous layer, hav e been calculated. The emission of oc particles has been simulated by a Mon te Carlo method. For both basal and secretory cells, the dose conversion co efficients (DCCs) for physical conditions of sleep, rest, light and heavy e xercise, have been obtained for Chinese males and females for unattached pr ogeny, and for attached progeny of diameters 0.02, 0.15, 0.25, 0.30 and 0.5 0 mum. For basal cells, the coefficients lie in the range 0.69-6.82 mGy/(J s/m(3)) or 8.7-86mGy/WLM for unattached progeny and in the range 0.045-1.98 mGy/(J s/m3) or 0.57-25 mGy/WLM for attached progeny. The corresponding ra nges for Caucasian males are 1.27-8.81 mGy/(J s/m(3)) or 16-111 mGy/WLM-1 a nd 0.05-2.30 mGy/(J s/m(3)) or 0.64-29 mGy/WLM. For secretory cells, the co efficients lie in the range 0.095-16.82mGSy/(J s/m(3)) (1.2-212mGy/WLM) for unattached progeny and in the range 0.095-6.67 mGy/(J s/m3) (1.2-84mGy/WLM ) for attached progeny. The corresponding ranges for Caucasian males are 0. 34-21.51 mGy/(Js/m(3)) (4.3-271mGy/WLM) and 0.1-7.78mGy/(Js/m(3)) (1.3-98mG y/WLM), The overall DCCs calculated for a typical home environment are 0.59 and 0.52mSv/(Js/m(3)) (7.4 and 6.5mSv/WLM) for Chinese males and females, respectively, which are 80 and 70% of the value, 0.73mSv/(Js/m(3)) (9.2mSv/ WLM), for Caucasian males. (C) 2001 Elsevier Science Ltd. All rights reserv ed.