Questions and Problems 305d gene at a is given a sample containing 5.00 mg of \( \mathrm{I}-131 \), how long will it take for \( 32 \% \) of the isotope to remain in her system?
Added by Gregg M.
Close
Step 1
The initial amount is 5.00 mg. Show more…
Show all steps
Your feedback will help us improve your experience
Dinesh Singh and 82 other Chemistry 101 educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
Iodine-131 is used to treat tumors in the thyroid. Its decomposition is first-order with a half-life of 8.1 days. If a patient is given a sample containing $5.00 \mathrm{mg}$ of $\mathrm{I}-131$, how long will it take for $32 \%$ of the isotope to remain in her system?
Radioactive isotopes are often introduced into the body through the bloodstream. Their spread through the body can then be monitored by detecting the appearance of radiation in different organs. ${ }^{131} \mathrm{I},$ a $\beta^{-}$ emitter with a half-life of $8.0 \mathrm{~d}$, is one such tracer. Suppose a scientist introduces a sample with an activity of $375 \mathrm{~Bq}$ and watches it spread to the organs. (a) Assuming that the sample all went to the thyroid gland, what will be the decay rate in that gland $24 \mathrm{~d}$ (about $3 \frac{1}{2}$ weeks) later? (b) If the decay rate in the thyroid 24 d later is actually measured to be 17.0 Bq, what percent of the tracer went to that gland? (c) What isotope remains after the I-131 decays?
Iodine-131 is a radioactive material that decays according to the function $A(t)=A_{0} e^{-0.087 t}$ where $A_{0}$ is the initial amount present and $A$ is the amount present at time $t$ (in days). Assume that a scientist has a sample of 100 grams of iodine-131. (a) What is the decay rate of iodine-131? (b) How much iodine- 131 is left after 9 days? (c) When will 70 grams of iodine- 131 be left? (d) What is the half-life of iodine-131?
Supreeta N.
Recommended Textbooks
Chemistry: Structure and Properties
Chemistry The Central Science
Chemistry
Watch the video solution with this free unlock.
EMAIL
PASSWORD