What is the amount of iodine − 131 left after 32 days if its half-life is of 8 days and the initial amount of iodine − 131 was of 2 gram?

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A sample of 1.0 × 1010 atoms that decay by alpha emission has a half-life of 100 min. How many alpha particles are emitted between t = 50 min and t = 200 min?

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Chapter 11, Problem 14P

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What is the amount of iodine − 131 left after 32 days if its half-life is of 8 days and the initial amount of iodine − 131 was of 2 gram?

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A sample of 1.0 × 1010 atoms that decay by alpha emission has a half-life of 100 min. How many alpha particles are emitted between t = 50 min and t = 200 min?

radioisotope? is 1,000 counts per 14. Iodine-131, a beta emitter, has a half-life of 8 days. A 2-gram sample of initially pure iodine-131 is stored for 32 days. How much iodine- 131 remains in the sample afterward? 15. An accident in a laboratory results in a room being contaminated by a radioisotope with a half-life of 3 days. If the radiation is measured to be eight times the maximum permissible level, how much time must elapse before the room is safe to enter? 16. The amount of carbon-14 in an ancient wooden bowl is found to be one-half that in a new piece of wood. How old is the bowl? 17. When the plutonium bomb was tested in New Mexico in 1945, approximately 1 gram of matter was converted into energy. How many joules of energy were released by the explosion? 18. A nucleus of element 112 is formed using the reaction equation given near the end of Section 11.7. It then undergoes six successive alpha decays. Give the identity of the isotope that results after each step of this…

Cobalt-60 and iodine-131 are used in treatments for some types of cancer. Cobalt-60 decays with a half-life of 5.27 years, emitting beta particles with a maximum energy of 0.32 MeV. Iodine-131 decays with a half-life of8.04 days, emitting beta particles with a maximumenergy of 0.60 MeV.(a) Suppose a fixed small number of moles of each of these isotopes were to be ingested and remain in the body indefinitely. What is the ratio of the number of millisieverts of total lifetime radiation exposure that would be caused by the two radioisotopes?(b) Now suppose that the contact with each of these isotopes is for a fixed short period, such as 1 hour. What is the ratio of millisieverts of radiation exposure for the two in this case?