radon

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Related to thoron: radon, thorium

radon

Colorless, odorless gas that occurs naturally due to the breakdown of minerals in the earth. It tends to become trapped in our modern, nearly air-tight homes. Since there has been some correlation between radon and lung cancer, the EPA recommends levels no higher than 4 picocuries per liter (pCi/L), although generally acceptable levels are in the range of 4 to 8 pCi/L. The EPA Web site at www.epa.gov has information on testing for radon and reducing it.

References in periodicals archive ?
Thoron is an Associate Professor of Agricultural Education in the Department of Agricultural Education and Communication at the University of Florida, 307A Rolfs Hall PO Box 110540, Gainesville, FL 32611, athoron@ufl.edu
The soil gas radon activity measurements were done in ten houses (selected based on indoor radon and thoron concentration, availability of power point, and safety of the equipment) where the active measurements were conducted using Portable Radon Monitor SMART RnDuo.
The health effect due to radon and thoron exposure was quantified in terms of the annual effective dose E.
where C (in Bq [m.sup.-3]) is the concentration of isotope of interest, Q (nSv per Bq h [m.sup.-3]) the dose conversion factor (9nSv per Bq h [m.sup.-3] for radon and 40 nSv per Bq h [m.sup.-3] for thoron), and F the equilibrium factor (EF) for radon and thoron ([F.sub.R] and [F.sub.T], resp.).
The values of indoor radon and thoron concentration of different places of Karbi Anglong District of Assam is shown in figure 1 and 2.
The average Thoron concentration varies from19.75 [Bqm.sup.-3] at Taradubi to 43.47 [Bqm.sup.-3] at Hojaipur.
P., Kulshreshtha, A., Sinha, D., Srivastava, A., Deka, P.C., Bhattacharjee, B., Ramachandran, T.V.andNambi, K.S.V., 2001, Simultaneous determination of radon, thoron and their progeny in dwellings, Radiation Measurements 33, 7-11.
A full description of the Vee map is beyond the scope of this paper, for further understanding of the Vee map in detail please refer to Thoron and Myers (2010b).
Researchers determined (Thoron & Myers, 2010) a priori that the intervention was not fully administered if a student missed 25% or more of instructional time.
Thoron and Myers (2011) found that students taught through inquiry-based instruction outperformed their counterparts when taught through this method.
The Thoron and Myers (2010) study indicated that the Vee map, as a formative assessment tool, was more effective in the agriscience classroom when compared to the laboratory report.
This tool provides for better thinking when measuring student content knowledge achievement (Thoron & Myers, 2010) and this study indicated it is unbiased based on gender, grade, and ethnicity.