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So, often layers of volcanic rocks above and below the layers containing fossils can be dated to provide a date range for the fossil containing rocks.
The atoms in some chemical elements have different forms, called isotopes.
Food and Drug Administration has approved the use of irradiation for fruits, vegetables, pork, poultry, red meat and spices. Department of Agriculture, more than 76 million Americans are affected by food-borne illnesses each year, and more than 5,000 die.These isotopes break down at a constant rate over time through radioactive decay.By measuring the ratio of the amount of the original (parent) isotope to the amount of the (daughter) isotopes that it breaks down into an age can be determined.Following an outbreak of illness traced to contaminated salad greens, the FDA in 2008 issued a final rule approving irradiation of iceberg lettuce and spinach.The purpose was to help protect consumers from infection by such bacteria as salmonella and E. The foods affected by the rule are loose, fresh iceberg lettuce and spinach and bagged iceberg lettuce and spinach.