In the past, the external exposure dose model for soil (the soil’s physical model) was used to calculate the doses of decorative building materials because there was no materials model. In this paper, physical models are proposed to calculate the absorbed dose rates in air from decorative building materials by Monte Carlo simulation with the EGSnrc code. The physical models of this paper greatly differ from physical models for soil. The good agreement between simulations and measured absorbed dose rate in indoor air indicates that the results obtained by the Monte Carlo simulations are realistic. The absorbed dose rates in air calculated by physical models for soil are much higher than the measured dose rates. According to the reports of UNSCEAR 2000 and ICRP 1999, the limits of radionuclides in some kinds of decorative building materials were deduced by using the physical models for materials presented in our work. The limits of every kind of decorative building material from our work are different.
* Physics and Electronics Department, University of Electronic Science and Technology of China, Chengdu 610054, China; † Center for Nuclear Safety of the State Environmental Protection Administration of China, Beijing 100088, China; ‡ Key Laboratory for Radiation Physics and Technology of the Ministry of Education, Sichuan University, Chengdu 610064, China.
For correspondence or reprints contact: M. Yahong, Physics and Electronics Department, University of Electronic Science and Technology of China, Chengdu 610054, China, or email at firstname.lastname@example.org.
(Manuscript received 15 July 2005; revised manuscript received 30 August 2005, accepted 19 December 2005)