Explanation Given data: The original source activity ( A 0 ) is 75 × 10 − 6 Ci , The half-life ( T 1 / 2 ) is 1.50 × 10 − 4 s , and The time ( t ) is 5 × 10 − 6 s . Formula used: Formula to calculate the decay constant is, λ = 0.693 T 1 / 2 (1) Here, T 1 / 2 is the half-life. Formula used to calculate the source activity is, A = A 0 e − λ t (2) Here, A 0 is the original source activity, λ is the decay constant, and t is the time. Substitute the equation (1) in equation (2) to find A . A = A 0 e − ( 0.693 T 1 / 2 ) t (3) Calculation: To calculate the source activity of a 75.0 -μCi sample of P 84 214 o (polonium): Substitute 75 × 10 − 6 Ci for A 0 , 1

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Chapter 23.9, Problem 7P

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Find the source activity of a 75.0-μCi sample of P84214o (polonium).

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Chapter 23.9, Problem 6P

Chapter 23, Problem 1RQ

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