23 Jun No Comments 1. Calculate the radiatio
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1. Calculate the radiation dosage (in grays) for an 77kg person that is exposed for 4.0 seconds to a 3.0 Ci source of beta radiation. Assume that 100% of the radiation is absorbed and each beta particle has an energy of 1.6× 10–13 J. 2. What is the activity of a 58.9 μCi sample of carbon14 in becquerels? 3. The nuclear mass of 56Fe is 55.9207 amu. Calculate the binding energy per nucleon for 56Fe. 4. A fossil is found to have a 14C level of 76.0% compared to living organisms. How old is the fossil? 5. 32P is a radioactive isotope with a halflife of 14.3 days. If you currently have 82.1 g of 32P, how much 32P was present 6.00 days ago? 6. Iodine131 is a radioactive isotope. After 8.00 days, 50.2% of a sample of 131I remains. What is the halflife of 131I? 7. Calculate the percent activity of the radioactive isotope cobalt60 remaining after 3 half lives. 8. The halflives of different medical radioisotopes are given in the table below. If the initial amount of arsenic74 is 2.3 mCi, how much arsenic74 is left in the body after 54 days? Radioisotope Halflife (days) Arsenic74 18 Iodine131 8 Phosphorus32 14 Chromium51 28 9. For the following fusion reaction, calculate the change in energy of the reaction in units of joules per mole. 10.
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