07.05 Radiation.docx - Radiation Worksheet Part 1 1 The...

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Radiation Worksheet Part 1 1. The graph above represents the nuclear decay of a radioactive element, measured using a radiation-detecting device. What is the half-life, in days, of this hypothetical element? The half-life is 2 days. 2. If the half-life of a given substance is 65 days, how long will it take for a 100- gram sample of the substance to decay until there is only 25 grams of the radioactive material remaining? If the half-life of a given substance is 65 days, the 100-gram sample substance will take 130 days to decay until there is only 25 grams remaining. 3. If a sample of radioactive isotopes takes 60 minutes to decay from 200 grams to 50 grams, what is the half-life of the isotope? Hint: First, determine how many times the sample has lost half of its mass, which tells you how many half-life cycles have occurred. The half-life of the isotope is 30 minutes. 4. If a 500.0 g sample of technetium-99 decays to 62.5 g of technetium-99 remaining in 639,000 years, what is the half-life of technetium-99? The half life of technetium-99 would be 213,000 years.
Part 2 Listen to the podcast (© 2015 The New York Times Company) to answer these questions. 1. How does a cell phone use radiation to function? Wireless transmissions happen through radiation. Transmission radiation carries the call/messages to the cell tower which thn carries the call/message to another cellphone. 2. Compare and contrast this type from other types of radiation. Microwave radiation is much weaker than ionizing radiation. On our cell phones, we use non-ionizing radiation which is less harmful to humans and does not cause cancer. 3. How can cell phone radiation be harmful to people? Cell phone radiation can be harmful to people through long-term heavy usage.

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