medical technician is working with the four samples of radionuclides listed in the table below. Initially, each sample contains 22.00 µmol of the radionuclide. irst, 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 1/8 of the initial amount. sample A B с D symbol 75 34 133 54 95 41 227 radionuclide 89 Se Xe Nb Ac half-life 120. days 5.0 days 35.0 days 22. years initial radioactivity (choose one) O (choose one) 0 (choose one) O (choose one) time for amount of radionuclide to decrease to 1/8 of initial amount days days days years

OSIMZ2/spwel... A" O NUCLEAR CHEMISTRY = Arvind V 1/5 Understanding radioactive half life A medical technician is working with the four samples of radionuclides listed in the table below. Initially, each sample contains 15.00 μmol 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 1/16 of the initial amount. radionuclide sample initial radioactivity time for amount of radionuclide to decrease to 1/16 of initial amount alb (choose one) years (choose one) days (choose one) hours (choose one) ✓ days B C D symbol 194 Os 76 96 43 212 82 88 39 Ic Pb Y half-life 6.0 years 4.0 days 11. hours 107. days X S ? M2²

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A medic hnican is working with the four samples of radionuclides listed in the table below. Initially, each sample contains 22.00 umol of the radionuclide. First, order the samples by decreasing initial radioactivity. Then calculate how long it will take for the amount of radionudlide in each sample to decrease to 1/8 of the initial amount. radionuclide time for amount of initial radioactivity radionuclide to decrease to 1/8 of initial amount sample symbol half-life 139 Ce 58 138. days (choose one) V days A 125 60.0 days (choose one) v O days B 53 77 Br 35 57.0 hours |(choose one) v hours 51 Mn O minutes D 46.0 minutes [choose one) v 25

A medical technician is working with the four samples of radionuclides listed in the table below. Initially, each sample contains 24.00 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 1/3 of the initial amount. radionuclide time for amount of radionuclide to decrease to 1/32 of initial amount sample Initial symbol half-ife radioactivity 177 Lu 71 7.0 days tehnose one 0 O days 212 Bi O nours 1. hour (choose one) e 83 85 O days Sr 65.0 days (choosa one) B 38 88 107. days O days D. Y (choose one) B 39 time for amount of radionuclide to decrease to radionuclide Initial sample radioactivity symbol half-life 1/32 of initial amount 177 Lu 7.0 days O days A v (choose one) 71 1 (highest) 212 Bi 83 1. hour O hours 3. 4 (lowest) 85 Sr 38 I days 65.0 days (choose one) O 88 107. days O days D Y. (choose one) B 39

A medical technician is working with the four samples of radionuclides listed in the table below. Initially, each sample contains 8.00 µmol 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 1/16 of the initial amount. sample A B C D symbol 82 37 127 54 149 65 91 radionuclide 39 Rb Xe Tb Y half-life 1. minute 36.0 days 4.0 hours 59.0 days initial radioactivity (choose one) (choose one) ✓ (choose one) ✓ (choose one) ✓ time for amount of radionuclide to decrease to 1/16 of initial amount minutes days hours days

A medical technician is working with the four samples of radionuclides listed in the table below. Initially, each sample contains 17.00 μmol 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 1/16 of the initial amount. sample A B D symbol 18 9 75 M 35 177 71 152 63 radionuclide F Br Lu Eu half-life 2. hours 98.0 minutes 7.0 days 13. years initial radioactivity (choose one) (choose one) O (choose one) (choose one) time for amount of radionuclide to decrease to 1/16 of initial amount hours minutes days years

For a radioactive sample with a half-life of about 94 days, storage in a lead lined cabinet for a sufficient length of time assures it will be safe before disposal. A radioactive sample is considered to be safe after 10 half-lives have expired. What percentage of the original radioactivity of the sample remains after this many half- lives? Report answer as a percentage, but do not include the percent symbol. Provide 3 significant digits of precision.

A medical technician is working with the four samples of radionuclides listed in the table below. Initially, each sample contains 17.00 µmol 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 1/32 of the initial amount. 000 radionuclide sample initial radioactivity time for amount of radionuclide to decrease to 1/32 of initial amount Ar days A days B hours C hours D symbol 192 Ir 77 188 74 62 30 67 31 W Zn Ga half-life 74.0 days 69.0 days 9.0 hours 78.0 hours (choose one (choose one) (choose one) (choose one) X ?

A medical technician is working with the four samples of radionuclides listed in the table below. Initially, each sample contains 25.00 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. radionuclide time for amount of radionuclide to decrease to 1/4 of initial amount initial radioactivity olo sample symbol half-life 64 Ga 31 3. minutes v (choose one) 1 (highest) Iminutes A 203 3 2. days I days Pb 4 (lowest) 82 122 4. minutes (choose one) minutes 53 32 14. days I days D (choose one) 15 Explanation Check Privacy Accessibility 2021 McGraw-Hill Education. All Rights Reserved. Terms of Use TO W MAY 1 10 MacBook Air