13) The activity of a radioactive sample is the number of decay events per second. The Sl unit of activity is the becquerel (1 Bq = 1/s). An older unit for activity is the curie (1 Ci = 3.70 x 10"/s). What is the activity in Bq of a sample with an activity of 47 uCi of radiation? (1 Ci = 10ª uCi) а) 7.9 х10° Вg с) 1.7х 10 Вq b) 7.9х 10° Bg d) 1.3 x 10-м Ва

13) The activity of a radioactive sample is the number of decay events per second. The Sl unit of activity is the becquerel (1 Bq = 1/s). An older unit for activity is the curie (1 Ci = 3.70 x 10"/s). What is the activity in Bq of a sample with an activity of 47 uCi of radiation? (1 Ci = 10ª uCi) а) 7.9 х10° Вg с) 1.7х 10 Вq b) 7.9х 10° Bg d) 1.3 x 10-м Ва

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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NUCLEAR CHEMISTRY: The mass defect of nuclei (105x ) is 1.106 amu. Estimate the total binding energy per nucleon in J/nucleon. (c = 2.998 x 108 m/s) Express your answers in three decimal places in scientific notation, i.e., 6.022e23 to represent 6.022 x 1023. Do not include the unit.
A worker in a laboratory unknowingly became exposed to a sample of radio-labeled sodium iodide made from iodine-131 (beta emitter, t1/2 = 8.07 days). The mistake was realized 28 days after the accidental exposure, at which time the activity of the sample was 25.6 × 10-5 Ci/g. The safety officer needed to know how active the sample was at the time of the exposure. Calculate the activity value in Ci/g.
5). Calculate the specific activity (MBq/g) of 0.353 g of NaTcO4. Assume all the technetium is 99Tc, and it is the only radioactive nuclide present. (t1/2 for 99Tc = 2.13 x 105 years)
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Gold-198, a B emitter used to treat leukemia, has a half-life of 2.695 days. The standard dosage is about 1.0 mCi/kg body weight. Part A What is the product of the B emission of gold-198? Express your answer as an isotope. Submit Part B A chemical reaction does not occur for this question. D Submit ΑΣΦ Part C How long does it take a 30.0 mCi sample of gold-198 to decay so f only 7.50 mCi remains? Express your answer using three significant figures. Review | Constants | Periodic Table Request Answer Submit ΑΣΦ Request Answer OF VD] ΑΣΦ How many millicuries are required in a single dosage administered 72 kg adult? Express your answer using two significant figures. ? Request Answer < Return to Assignment Provide Feedback days ? mCi
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Many elements have been synthesized by bombarding relatively heavy at particle accelerators. Complete the following nuclear reaction, which have elements. + 15N → 269Db + 4 n 105 Example of answer: If your answer is 14, write it as 14N (it is clear tha protons, so the number 7 might be skipped). If your answer is n (neutror For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). BIUS Paragraph V Arial M 10pt Click Save and Submit to save and submit. Click Save All Answers to save all answers.
(Q114) A meteorite recovered from a meteor landing site in the Australian outback contains 0.438 g of lead-206 for every 1.000 g of uranium-238 that it contains. Assuming the rock did not originally contain any lead-206, how old is the meteorite? (The half-life for this decay process is 4.5 x 10⁹ years). 2.3 x 10⁹ years 2.7 x 10⁹ years 4.4 x 10⁹ years O 1.5 x 1010 years O 7.1 x 10⁹ years
Iodine-125 (¹251) is used to treat, among other things, brain tumors and prostate cancer. It decays by gamma decay with a half-life of 54.90 days. Patients who fly soon after receiving ¹25I implants are given medical statements from the hospital verifying such treatment because their radiation could set off radiation detectors at airports. If the initial decay rate (or activity) was 517 µCi, what will the rate be after 381.0 days? decay rate: μCi How many months after the treatment will the decay rate be reduced to 10.5% of the original value? Assume months of 30 days. months:
¹C 18F 51 Cr 50Fe Ga Se 81mKr Sr 99m Tc 1331 19Hg 20171 Some Radioactive Isotopes Useful in Medical Imaging Mode of Decay Isotope Carbon-11 Fluorine-18 Phosphorus-32 Chromium-51 Iron-59 Gallium-67 Selenium-75 Krypton-81m Strontium-81 Technetium-99m Iodine-131 Mercury-197 Thallium-201 B+, Y B+ , Y B E.C., y B, Y E.C., Y E.C., Y Y В Y B, Y E.C., Y E.C., Y Half-life 20.3 m 109 m 14.3 d 27.7 d 44.5 d 78.3 h 118 d 13.3 s 22.2 m 6.01 h 8.04 d 64.1 h 3.05 d Use in Medical Imaging Brain scan to trace glucose metabolism Brain scan to trace glucose metabolism Detect eye tumors Diagnose albinism, image the spleen and gastrointestinal tract Bone marrow function, diagnose anemias Whole-body scan for tumors Pancreas scan Lung ventilation scan Scan for bone diseases, including cancer Brain, liver, kidney, bone scans; diagnosis of damaged heart muscle Diagnosis of thyroid malfunction Kidney scan Heart scan and exercise stress test The radioactive isotope mercury-197 is used in medical imaging as…
Answer number 3
NUCLEAR CHEMISTRY: The mass defect of nuclei (101x) is 1.802 amu. Estimate the total binding energy per nucleon in J/nucleon. (c = 2.998 x 10° m/s) Express your answers in three decimal places scientific notation, ie., 6.022e23 to represent 6.022 x 1023 Do not include the unit.