"Tobacco Plants Are Grown in Soils with High-Phosphate Fertilizers That

question 34

Multiple Choice

"Tobacco plants are grown in soils with high-phosphate fertilizers that are naturally contaminated with the alpha-particle emitting radionuclide polonium-210.In one year, the average smoker will irradiate the bronchial epithelium with 8 to 9 rem, the equivalent dose of radiation from 250 to 300 chest X-ray films per year"( Pediatrics, September 1993, p.464) .How does this annual dose from tobacco compare to an average annual dose of 3.6 mSv that a nonsmoker receives from background radiation?

• A)about 250 times more
• B)about 25 times more
• C)about 3 times more
• D)about 1/4 as much
• E)about 1/3 as much

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