Gallium-67 is a radioactive isotope used in treatment of lymphomas. If 63.5% of a 6'Ga sample remains in the patient 2.37 days after injection, what is the half-life of 67Ga? t1/2 = days * TOOLS x10
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- Needs Complete solution. Plz.20.0 hours after being ingested 74.5 % of the original radioactive atoms have decayed or been eliminated. If the biological half-life is known to be 35.0 hours, what is the physical half-life of this isotope? State the time in hours to 1 decimal places but do NOT include units in your answer. Your Answer:3. The following graph shows the amount of mg for a radioactive substance. a. Determine the initial quantity of the material. b. Determine the half-life for this substance. 200 180 160 140 120 100 80 60 40 20 c. Determine the percent decrease per hour. d. Determine how long it will take for only 25 mg of the substance to remain. 10 (12,50) 15 20 25 30 W 35 40
- 1.The half life of radium - 226 isn1. 8×10^3 years. a. What is the activity in Curries of 3.00 g sample of Ra-226? b. What is the mass in grams of a sample of Ra-226 that has an activity of 1.30×10^9 atoms /min.A radioactive sample has a decay constant of 49.15x10-12 s¹. Estimate the half-life.After 1.80 days, the activity of a sample of an unknown type radioactive material has decreased to 80.4% of the initial activity. What is the half-life of this material?
- 7. One of the many isotopes used in cancer treatment is 198 Au, with a half-life of 2.70 d. Determine the mass of this isotope that is required to give an activity of 225 Ci. mg VJSS f60 ssf ( sf60 ssfThe half-life of radon-222 is about 3.823 days. (a) Determine the decay constant for radon-222. 2.1x10-65-¹ ✓ (b) What percentage of a sample remains undecayed after two weeks (1.21 x 106 s)? %