(a) Write the equation for the decay of 232 Th by a single alpha particle. (b) Determine the energy Q released in this decay. (c) What percentage of the 232Th nuclei that existed when the Earth was formed 4.54 billion years ago are still around today?
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- The half-life of 222Rn is 3.82 days. (a) Convert the half-life to seconds. 330048 (b) Calculate the decay constant for this isotope. 2.1e-6 s-1 (c) Convert 0.430 µCi to the SI unit the becquerel. 15910 Bq (d) Find the number of 22Find the activity A of a sample containing 4E-6 g of 60/27 Co (T1/2= 5.27 years). (Use 59.93 u as the mass of 60/27 Co.) Radioactive decay constant: A)2.41E8 B)0.132 C)4.15E-9 D)7.60 Activity in curies: A)4.51E-3 Ci B)8.26E9 Ci C)1.43E8 Ci D)4.51 Ci1) A small building has become accidentally contaminated with radioactivity. The longest-lived material in the building is strontium-90. (has an atomic mass 89.907 7 u, and its half-life is 29.1 yr. It is particularly dangerous because it substitutes for calcium in bones.) Assume that the building initially contained 250 g of this substance uniformly distributed throughout the building and that the safe level is defined as less than 10.0 decays/min (to be small in comparison to background radiation). Estimate how long will the building be unsafe?The common isotope of uranium, 238U, has a half-life of 4.47 * 109 years, decaying to 234Th by alpha emission. (a) What is the decay constant? (b) What mass of uranium is required for an activity of 1.00 curie? (c) How many alpha particles are emitted per second by 10.0 g of uranium?The common isotope of uranium, 238U, has a half-life of 4.47 * 109 years, decaying to 234Th by alpha emission. (a) What is the decay constant? (b) What mass of uranium is required for an activity of 1.00 curie? (c) How many alpha particles are emitted per second by 10.0 g of uranium?In a nuclear reactor accident, the 137Cs (?1/2 = 30.2 years) nuclide is among the most problematic fission products. The energy released by the B-decay of 137Cs into the stable 137Ba is 1.17 MeV. a) Why is 137Cs considered as one of the most problematic fission products in a reactor accident? Give two reasons. b)Give two possible ways that 137Cs is produced in a pressurized water reactor. Write down the corresponding equation in each process. c)What is the percentage of a sample of 137Cs that will decay in one year? [Hint: the lifetime r is related to the half-life ?1/2 by r = ?1/2 ln2 .] d)If the radiation dose limit is 20 mSv per annum, what is the maximum amount of 137Cs that a 60-kg person can swallow without affecting his health?Complete each of the following nuclear reaction equations: (a)23592U + 10 n ---> 14156Ba + _____ (formula) + 3 10n (b)23892U ---> 23490Th + ________ ( formula and name) (c)3015P ---> 3014Si + _______ (formula and name) (d) 22888Ra ---> 22889Ac + ______ (formula and name)(a) Write the complete α decay equation for 226 Ra . (b) Find the energy released in the decay.help pleaseFind the activity A of a sample containing 4E-6 g of 60/27 Co (T1/2= 5.27 years). (Use 59.93 u as the mass of 60/27 Co.) Radioactive decay constant: A)2.41E8 B)0.132 C)4.15E-9 D)7.60 Activity in curies: A)4.51E-3 Ci B)8.26E9 Ci C)1.43E8 Ci D)4.51 CiNatural gold has only one isotope, 79197Au. If gold is bombarded with slow neutrons, e- particles are emitted. (a) Write the appropriate reaction equation. (b) Calculate the maximum energy of the emitted beta particles. The mass of 80198Hg is 197.966 75 u.please solve question 3SEE MORE QUESTIONS