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a) The half-life of iodine-125 is 59.4 days. If the initial mass of iodine-125 is 128 µg, what mass of iodine-125 will be remaining 297 days later? (Hint – consider this length of time in terms of the number of half-lives). b) Radioactive source A has an initial activity of 3.42 x 10* Bq and a decay constant of 4.17 x 10-9 s*. Radioactive source B has an activity of 5.52 x 104 Bq and a decay constant of 8.05 x 10-9 s*. i) Which of the two sources will have the highest activity after 4 years. (1 year = 3.154 x 107 s)? ii) How many years will it take source A to reach an activity of 1.00 x 10* Bq? [3.3]

a) The half-life of iodine-125 is 59.4 days. If the initial mass of iodine-125 is 128 µg, what mass of iodine-125 will be remaining 297 days later? (Hint – consider this length of time in terms of the number of half-lives). b) Radioactive source A has an initial activity of 3.42 x 10* Bq and a decay constant of 4.17 x 10-9 s*. Radioactive source B has an activity of 5.52 x 104 Bq and a decay constant of 8.05 x 10-9 s*. i) Which of the two sources will have the highest activity after 4 years. (1 year = 3.154 x 107 s)? ii) How many years will it take source A to reach an activity of 1.00 x 10* Bq? [3.3]

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Question 10 a) The half-life of iodine-125 is 59.4 days. If the initial mass of iodine-125 is 128 ug, what mass of iodine-125 will be remaining 297 days later? (Hint - consider this length of time in terms of the number of half-lives). b) Radioactive source A has an initial activity of 3.42 x 10* Bq and a decay constant of 4.17 × 10-9 s. Radioactive source B has an activity of 5.52 x 104 Bq and a decay constant of 8.05 x 10-9 s. i) Which of the two sources will have the highest activity after 4 years. (1 year = 3.154 x 107 s)? ii) How many years will it take source A to reach an activity of 1.00 x 10* Bq? [3.3] Question 11
Transcribed Image Text:Question 10 a) The half-life of iodine-125 is 59.4 days. If the initial mass of iodine-125 is 128 ug, what mass of iodine-125 will be remaining 297 days later? (Hint - consider this length of time in terms of the number of half-lives). b) Radioactive source A has an initial activity of 3.42 x 10* Bq and a decay constant of 4.17 × 10-9 s. Radioactive source B has an activity of 5.52 x 104 Bq and a decay constant of 8.05 x 10-9 s. i) Which of the two sources will have the highest activity after 4 years. (1 year = 3.154 x 107 s)? ii) How many years will it take source A to reach an activity of 1.00 x 10* Bq? [3.3] Question 11
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