If it is in the blood, lead-209 has a physical decay constant of s−1 and a biological decay constant of s−1. What is the effective decay constant for lead? Give your answer in scientific notation to two decimal places.
Which of the following formulas correctly shows how the effective decay constant of a substance relates to its physical decay constant and its biological decay constant?
The table shows the physical and biological half-lives for four radioisotopes.
Which radioisotope has the shortest effective half-life?