does it take frasample oflead 2 1 4 to decay to 4.15%ofitsinitial value? (see ta

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does it take frasample oflead 2 1 4 to decay to 4.15%ofitsinitial value? (see table ffor the ha-life.) (5 pts) Applications of Radioactive Isotopes rhe half-lives of different radioactive nuclides range from fractions of a second to billions of years Examples of parent-daughter pairs, their decay processes, half-lives, and applications are listed below Table 2: Half-lives, Types of Decay and Applications of Radloactive Isotopes Decay Precess Half-life 28.8 years 13 hours 8 days 8 emission and skin dineases Thyeoid iaging lodine-123/ Tellerium-123 lodine-131/ Xenon-131 echnetium-99 Phosphoras-32/Sulfur-32 8 emission Loukemia Therapy,tracers used n DNA 14.28 days 432 years 24.400 years 713 milion years Nuclear reactors Unni m-235 / 207 series ofa and emissions electron captre billion years 5730 year 50 billion yers 50 billion years Carbon-14 / Natrogen-14 Archeological Dating series of 14 a and Uranium-238/ Lead-206 Uses for Radioactive Isotopes Medical professionals often use radioactive isotopes to visualize certain parts of the body. One such chemical is a phosphate compound of Technetium-99m (Te-99m). lo hours (Use Table 2] (2 pts) 1. The half-life for Technetium-99m is Ifone is having such a bone scan done, the Te-99m compound is administered intravenously, and the scan is done three hours later 2. HL (3 pts) How many half-lives (HL) have passed when the scan is done, 3. Use the information from questions 1 and 2 to calculate what percentage of the Tc-99m remains in the body after the scan is done. Use three significant figures for the percentage and show your work! (3 pts) Smoke detectors also take advantage of radioactivity by using Americium-241, an artificially produced radioactive isotope that emits alpha particles and low energy gamma rays. 4. The half-life for Americium-241 is 482years ·(Use Table 2](2 5. How many halflives have passed after 100 years? HIL (use three significant figures) G pts) Page 5 of 6 GCC CHM1S2LL: Niuclear Chemisry @GcC 2017 Page 1 of 6

Explanation / Answer

Answer:

We know that the physical half-life differ from the biological half-life

so in the biological system, the Half-life for the Tc-99m is 1.2 hr and not 6

teff-t effective

tbio-t biological

tphy- t physical

for example

A Tc-99m compound has a teff = 1 hr. What is tbiol. 1/ tbiol = 1/ teff - 1/ tphys = 1/1 - 1/6 = 5/6 so... tbiol = 1.2

since 3 hours have passed,

so more than two half-lives have passed,(1.2*3=3.6)

Thanks :)

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