caa a22 4500 397504225 CHVBK 20180308164540.0 cr unu---uuuuu 161202e19950401xx s 000 0 eng 10.1093/oxfordjournals.rpd.a082644 doi 0144-8420 pii (NATIONALLICENCE)oxford-10.1093/oxfordjournals.rpd.a082644 Distributions of Thoron Progeny Concentrations in Dwellings [Elektronische Daten] [T. Yamasaki, Q. Guo, T. Iida] The distribution of thoron (220Rn) and thoron progeny indoors was derived from the diffusion equation in two-dimensions. In the ordinary living environment, thoron concentration decreases exponentially with the distance from the wall. The activity of 216Po is almost in radioactive equilibrium with thoron due to the very short half-life of 216Po. Comparing the average concentration in the room, the number of attached 212Pb atoms is about seventy times larger than that of unattached 212Pb. The concentrations of 212Pb and 212Bi are spatially homogeneous. However, in the case of a small effective diffusion coefficient, a concentration distribution appears. In such a case, the absorbed dose from the thoron progeny could vary according to is proximity to the wall or the centre of the room. The general characteristics of thoron and its progeny concentration distribution indoors is presented. Radiation Protection Dosimetry Yamasaki T. aut Guo Q. aut Iida T. aut Radiation Protection Dosimetry Oxford University Press 59/2(1995-04-01), 135-140 0144-8420 59:2<135 1995 59 rpd https://doi.org/10.1093/oxfordjournals.rpd.a082644 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/oxfordjournals.rpd.a082644 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yamasaki T. aut NATIONALLICENCE 700 1- Guo Q. aut NATIONALLICENCE 700 1- Iida T. aut NATIONALLICENCE 773 0- Radiation Protection Dosimetry Oxford University Press 59/2(1995-04-01), 135-140 0144-8420 59:2<135 1995 59 rpd Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford