5) Thorium-228 is radioactive and undergoes alpha decay. How many protons and neutrons does Thorium-228 have? (Give two

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5 Thorium 228 Is Radioactive And Undergoes Alpha Decay How Many Protons And Neutrons Does Thorium 228 Have Give Two 1 (46.19 KiB) Viewed 36 times

5 Thorium 228 Is Radioactive And Undergoes Alpha Decay How Many Protons And Neutrons Does Thorium 228 Have Give Two 2 (14.12 KiB) Viewed 36 times

5) Thorium-228 is radioactive and undergoes alpha decay. How many protons and neutrons does Thorium-228 have? (Give two numbers.) b. What is the "daughter nucleus" for Thorium-228? a 6) Californium-248 is radioactive and undergoes alpha decay. How many protons and neutrons does Californium-248 have? (Glve two numbers.) b. What is the daughter nucleus" for Californium-248? 7) Thorium-232 has a half-life of 14.05 billion years. The decay product of thorium-228 is alpha particles with a kinetic energy of 4.08 MeV. a. What is the decay constant for thorium-228? b. If a single Thorium-228 nucleus exists today, what is the probability that it will still exist 4.0 billion years from today? What is the activity of the 0.43 moles of Thorium-232? d. If a 72 kg person absorbs 1.5% of the radioactive alpha particles emitted in 2.1 seconds, what is the equivalent dose absorbed? Is it dangerous ? c 8) Nitrogen-16 has a decay constant of 0.0972/s. The decay product of nitrogen-16 is an electron with 10.4 MeV of kinetic energy a. What is the half-life of Nitrogen-16? b. How long will it take a sample of 2.12 moles of Nitrogen-16 to decay into 0.43 moles of Nitrogen-16 and 1.69 moles of Oxygen-16? C. What is the activity of the 0.43 moles of nitrogen-167 d. If a 72 kg person absorbs 1.5% of the radioactive electrons emitted in 2.1 seconds, what is the equivalent dose absorbed? Is it dangerous?
1. a) 8.35227x10-” kg b) 8.32141x10" kg c) 1.7x101) 2. a) 391.975x10 kg b) 391.666x107 kg c) 16.7x1012) 3. a) 13p and 13n b) no answer provided c) no answer provided 4. a) 22p and 29n b) no answer provided c) no answer provided 5. a) 90p and 138n b) no answer provided 6. a) 98p and 150n b) no answer provided 7. a) 4.933x10"/year or 1.562x10-11/5 b) 82% c) 4.05x10 Bq 8. a) 7.13 b) 16.45 c) 2.517x10 Bq d) 2.23x10 SV d) 1.83x10'S