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.© SolutionLibrary Inc. solutionlibary.com 9836dcf9d7 https://solutionlibrary.com/physics/nuclear/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-398
...e: Calculate the total amount of K40 found in the 75 kg human.
Total K40 = 0.012% (K40 in nature) * 0.35% (total K in human) * 75 kg
Total K40 = 3.15x10-2 g
Step two: Convert the mass of K40 found in the 75 kg human to the number of atoms of K40 in the human. (You will need the molecular mass of K40 (40 g per mole), as well as Avogadro's number (6.023x1023 atoms per mole)).
# of K40 atoms = 3.15x10-2g * (1 mole/40 g)*(6.023x1023 ...