1. The synthetic radioisotope technetium-99, which decays by beta emission, is the most widely used isotope in nuclear medicine. The following data were collected on a sample of Tc-99. Disintegrations per Time (hr) minute |180 |130 2.5 |104 5.0 77 7.5 59 10.0 46 12.5 24 |17.5 Using these data, give the equation of the best-fit line and determine the half-life of Tc-99. What is the activity of Tc-99 at 15 hours?

This experiment will use a technique known as neutron activation analysis (NAA) to determine the half-lives of two unusual isotopes, 28 Al and 20F. The only stable isotopes of these elements are 27 Al and 19F. Trace amounts of 26 Al and 18F occur naturally, but the isotopes we will generate today are even more unstable and have no significant natural abundance. To produce these very unstable isotopes in measurable concentration, samples containing Al and F are placed next to a source of energetic neutrons. A number of neutron sources can be used; in this lab the samples are placed inside an operating nuclear reactor that emits energetic neutrons. This source has the advantage of a high neutron output that creates the desired isotopes rapidly and at higher concentrations, but it is only feasible for researchers that have access to nuclear reactors. At Oregon State University, the campus TRIGA reactor is set up for NAA experiments. SECTION 2 Based on the description from the last…

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

Cancer therapy with radioactive rhenium-188 shows promise in patients suffering from colorectal cancer. a. Write the symbol for rhenium-188 and determine the number of neutrons, protons, and electrons. b. The half-life of rhenium-188 is 17 hours. If it takes 30 minutes to bind the isotope to an antibodythat delivers the rhenium to the tumor, what percentage of the rhenium remains after binding tothe antibody?

Identiy the missing particle in the following nuclear equation. Please help! How do i DO THIS?

A medical technician is working with the four samples of radionuclides listed in the table below. Initially, each sample contains 13.00 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 symbol half-life 46 A Sc 84.0 days (choose one) 21 21 time for amount of radionuclide to decrease to 1/16 of initial amount ☐ days 91 B Y 59.0 days (choose one) ☐ days 39 ur 52 C Mn 6.0 days (choose one) ☐ days 25 18 D F 2. hours (choose one) hours 9 1 (highest) half 2 3 4 (lowest) х Ar ?

A medical technician is working with the four samples of radionuclides listed in the table below. Initially, each sample contains 19.00 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 A (choose one) days B (choose one) years C (choose one) hours D (choose one) years symbol 33 P 15 194 76 64 29 179 73 Os Cu Ta half-life 25.0 days 6.0 years 13. hours 2. years X Ś ?