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RADON GENERATION AND TRANSPORT IN AGED CONCRETE
Citation:
Rogers, V., K. Nielson, AND R. Holt. RADON GENERATION AND TRANSPORT IN AGED CONCRETE. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-95/032 (NTIS 95-181590), 1995.
Impact/Purpose:
information
Description:
The report gives results of a characterization of radon generation and transport in Florida concretes sampled from 12- to 45-year-old residential slabs. It also compares measurements from old concrete samples to previous measurements on newly poured Florida residential concretes. Radon generation in the aged slabs was characterized in terms of concrete radium concentrations and radon emanation coefficients, and radon transport was characterized by radon diffusion coefficients and air permeability coefficients. The radium concentrations and radon emanation coefficients (0.11 +/- 0.04) of the old concretes in the study are about the same as those measured previously for newly poured residential concrete samples. The measured radon diffusion coefficients ranged from 1.5 to 5.5 X ten to the minus 7th power sq m/sec. On the average, these values are about a factor of 2 higher than average values for new residential concretes. The measured air permeability coefficients also average about a factor of 2 higher than for new concretes.
