Use the Following Information to Answer the Questions
a Radioactive $H_{p}$

question 51

Multiple Choice

Use the following information to answer the Questions
A radioactive element used in medicine has a physical half-life $H_{p}$
(the time in which half of any quantity of the element decays) and a biological half-life $H _ { b }$ (the time in which half of an amount of this element in the body is excreted) . The effective half-life $H _ { e }$ is calculated from $\frac { 1 } { H _ { e } } = \frac { 1 } { H _ { p } } + \frac { 1 } { H _ { b } } .$
-The physical half-life of sulfur-35 is 87.4 days and its biological half-life is 90 days. Find the effective half-life of sulfur-35.

• A) 44.3 days
• B) 88.7 days
• C) 177.4 days
• D) 201.2 days

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