Homework 7 key

# Homework 7 key - half-life of 1.83 hours Assuming that the...

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Homework 7 Name: _______________ 1. Write the nuclear equation for the indicated decay of each of the following nuclides. a. U-234 (alpha) b. Th-230 (alpha) c. Pb-214 (beta) d. O-15 (positron) e. cr-51 (electron capture) 2. Write the nuclear reactions for the following decay series: Th-232 undergoing , , , decays. 3. A sample of F-18 has an initial decay rate of 1.5 x 10 5 s -1 . how long will it take for the decay rate to fall to 1.0 x 10 2 s -1 ? (F-18 has a half-life of 1.83 hours).

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4. An ancient skull has a carbon-14 decay rate of 0.85 disintegrations per minute per gram of carbon (0.85 dis/min*g C). How old is the skull? (Assume that living organisms have a carbon-14 decay rate of 15.3 dis/min*g and that carbon-14 has a half-life of 5730 years). 5. If 1.0 g of matter were converted to energy, how much energy would be formed? 6. PET studies require fluorine-18, which is produced in a cyclotron and decays with a
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Unformatted text preview: half-life of 1.83 hours. Assuming that the F-18 can be transported at 60.0 miles per hour, how close must the hospital be to the cyclotron if 65% of the F-18 is to make it to the hospital? 7. Calculate the mass defect and nuclear binding energy per nucleon (in MeV) for C-16, a radioactive isotope of carbon with a mass of 16.014701. (mass of 1 1 H = 1.00783 amu, mass of 1 n = 1.00866 amu, and 1 amu = 931.5 MeV.) 8. (#22 Zumdahl) Americium-241 is widely used in smoke detectors. The radiation released by this element ionizes particles that are then detected by a charged-particle collector. The half-life of 241 Am is 432.2 years, and it decays by emitting alpha particles. How many alpha particles are emitted each second by a 5.00 g sample of 241 Am?...
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Homework 7 key - half-life of 1.83 hours Assuming that the...

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