Find the activity of a sample containing 4.84  1014 iodine-131 nuclei (T1/2 = 8.0 days).

You have a sample of unknown medication that is radioactive. You believe you should be able to identify the medication if you can deduce its half-life. You measure its initial activity as 2.30e+06 Bq. 10.4 hours later you measure its activity as 8.10e+05 Bq. a) What is the half-life of this unknown sample? hour b) How many nuclides are present when the activity is 8.10e+05 Bq?

Find the activity of a sample containing 1.63  10-6 g of (60/27)Co  (T1/2 = 5.27 years).

The half-life of Ra-226 is 1.60 x 10^3 years = 5.05 x 10^10 s Find k What is the activity in curies of a 1.00 g sample? What is the mass in grams of a Ra-226 sample that has an activity of 1.00 x 10^9 atoms/min?

3. (a) Calculate the decay constant for cobalt-60 (T1/2 = 5.26 Years) in units of week-¹ (b) Calculate the activity of a 5000-Ci cobalt-60 source after 10 years.

Find the activity of a sample Containing 701X 1019 10aine-131 nuciei (T1/2=8.0 days).

(a) At an initial time, a radioactive sample has an activity of 8.52x104 Bq. After 3.85 hours the activity is 5.42×104 Bq. (A) What is the half-life of the isotope? (B) What is the activity after an additional 3.85 hours? (A) (in s) OA: 2.285x103 (B) (in Bq) OA: 1.149x104 OB: 3.314x103 OB: 1.344x104 OC: 4.805x103 OC: 1.573x104 OD: 6.967x103 OD: 1.840x104 OE: 1.010x104 OE: 2.153x104 OF: 1.465x104 OG: 2.124x104 OF: OG: 2.519x104 2.947x104 OH: 3.080x104 OH: 3.448x104

Find the activity of a sample containing 6.92 x10-6 g of  (T1/2 = 5.27 years).