Isotopes and Radioactive Decay. Calculate the total radioactivity that results from one isotope in the human body. Must understand the concepts of half-life, decay constant, DPM, decay.

K40 (half-life=1.3x10E9 years) composes approximately 0.012% of the potassium found in nature. By weight, the human body is approximately 0.35% potassium. Calculate the total radioactivity that results from K40 decay in a 75 kg human.

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K40 (half-life=1.3x10E9 years) composes approximately 0.012% of the potassium found in nature. By weight, the human body is approximately 0.35% potassium. Calculate the total radioactivity that results from K40 decay in a 75 kg human.

226-88 Ra, a common isotope of radium, has a half-life of 1620 years. Knowing this, calculatethe first order rate constant for thedecay of radium-226 andthe fraction of a sample of this isotope remaining after 100 years.

Which of the following statements are true about decay rates and half-life?
True False a large decay constant implies a long half-life
True False in carbon dating, theradioactiveisotope of carbon that is used is carbon-12
True False half-life is the time it takes for a radioactive sample to decay away to nothing

The equation for radioactivedecay is: N(t) = Noe-kt, where No is the initial number of radioactive atoms, N(t) is the number of radioactive atoms left after a time t, and k is thedecay constant. The half-life of carbon 14 is about 5730 years.
Radioactive carbon dating makes the assumption that living things absorb carbon 14

How long would it take for a radioactiveisotope with a half life of 2 weeks to lose at least 70% of its radioactivity?
Describe two clinical uses of Radioactivity.

I'm not sure my answer is right.
7. A sample of a radioactiveisotope is found to have an activity of 115 Bq immediately after it is pulled fromthe reactor that formed it. Its activity 2 hours and 15 minutes later is measured to be 85.2 Bq. (a) Calculatethedecay constant andthe half-life of the sample. (b) How many radioa

A one- milligram sample of Cu-64 (nuclear mass =63.92 amu) has an activity of 3.82*10^3 Ci.
1a) How many atoms are in the sample?
b) What is thedecay rate in atoms/s?
c) What is the rate constant in min-1?
d) What is the half-life in minutes?
2) What percentage of Cu-64 will decay in 4.00hr?

A radioactivedecay series that begins with 237/93 Np ends with formation of the stable isotope 209/83 Bi. How many alpha particle emissions and how many beta particle emissions are involved in the sequence of radioactivedecay?

3. The half-life of iodine-131, an isotope used in the treatment of thyroid disorders, is 8.04 d.
(a) If a sample of iodine-131 contains 5.0 1016 nuclei, what is the activity of the sample? Express your answer in curies.
(b) If the half-life of iodine-131 were only one-fifth of its actual value, calculatethe factor by wh

Could you please provide the work for these questions?
7. How many kilograms of aluminium are produced in 24.0 hours by the electrolysis of molten AlCl3, if the current is 100.0 A?
8. What isotopedecays, by beta emission, to give 131/54 Xe? (Please see the attached file for proper formatting.)
9. A given radioactive is