11) The decay curve shown below approximates the decay of carbon-14. What is the approximate half-life of carbon-14? Radiocarbon decay 100.0 90.0 80.0 70.0 600 50.0 40.0 30.0 20.0 10.0 00 5,000 10,000 15,000 20,000 25,000 30,000 35000 40,000 Time (years) A) 5000 years B) 10,000 years C) 20,000 years D) 40,000 years Amount of C14 remaining (%)

||| Understanding radioactive half life sample A medical technician is working with the four samples of radionuclides listed in the table below. Initially, each sample contains 19.00 umol of the radionuclide. First, order the samples by decreasing initial radioactivity. Then calculate how long it will take for the amount of radionuclide in each sample to decrease to 1/4 of the initial amount. A B C D Explanation symbol 33 15 188 75 127 54 227 89 radionuclide P Re Xe Ac Check half-life 25. days 17. hours 36. days 22. years initial radioactivity (choose one) B (choose one) (choose one) O (choose one) e time for amount of radionuclide to decrease to 1/4 of initial amount X days hours days years S MacBook Pro 0/3 Kimberly V ( Ⓒ2023 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center | Accessibility ?圖□ 圆图 olo Ar

. You have 44.3 mg of the radioactive isotope 1311. How long will it take for the amount of 1311 to drop to 15.3 mg? 131 has a half-life of 8.02 days. A) 8.02 days B) 12.3 days C) 23.5 days D) 10.8 days E) 19.8 days Write a nuclear equation for the alpha decay of Am-241. A) 24 Am → He + ½/He + 233Np B) 24 Am → He + 245Bk 97 -je + 241 Cm C) 245Am → →e+ D) 241-3 Am → ₁e + 241 Pu → 94 241 95 E) 29-Am Am → → 1/1/n + În + 240 Am

Fluorine-18, which has a half-life of 110 minmin, is used in PET scans. 2) If 120. mgmg of fluorine-18 is shipped at 7:00 A.M., how many milligrams of the radioisotope are still active when the sample arrives at the radiology laboratory at 4:10 P.M.?