Chemistry
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ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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(c ) Iodine-131 has a half-life of 8 days. How many grams of I-131 in a 4.0 g sample remain after 24 days?
(d) The half-life of 32P, which is used as a label on red blood cells to determine blood volume, is 14.3 days. How many days are required for the activity of a sample of 32P to drop to 5.0% of its initial level?
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- How many days would it take for a 1.0 milligram sample to reach this level if the half-life polonium-210 is 138 days? Given: Maximum safe body burden of polonium-210 is 7.0x10-12 gramsarrow_forwardA patient ingests 1.48 mgmg of 131I131I (iodine-131), a beta emitter with a half-life of 8.0 days. Assuming that none of the 131I131I is eliminated from the person's body in the first 4.0 hours of treatment, what is the exposure (in CiCi) during those first four hours?arrow_forwardA radioactive isotope has an activity of 9.94×104 Bq initially. After 3.35 hours the activity is 5.96×104 Bq. What is the half-life of the isotope, and what is it after 3.5 hours?arrow_forward
- (A). Sodium-24 has a decay constant of 4.63 x 10-2 h-1. What is its half life? (B) The half life of radon-222 is 3.823 days. What is its decay constant?arrow_forward14.20 Round your answers to 6 decimal places. Box your final answers.arrow_forwardA clinical technician finds that the activity of a sodium-24 sample is 96 cpm. What will be the activity of the sample 45 h later if the half-life of sodium-24 is 15 h?arrow_forward
- 237 Np 93 decays by α−particle emission and has a half-life of 2.20 ×106 years.237Np = 237.0 g/mol (a) What is the activity, in millicuries, of a 0.385−g sample of 237 Np 93 _____ millicuries (b) Write a balanced nuclear equation for the decay of 237 Np 93 .arrow_forwardA patient swallows a radiopharmaceutical tagged with phosphorus-32 15 a B- emitter with a half-life of 14.3 days. The average kinetic energy of the emitted electrons is 700 keV. The initial activity of the sample is 1.31 MBq. (a) What is the number of electrons emitted in a 7.5 day period? electrons (b) What is the total energy deposited in the body during the 7.5 days? (c) What is the absorbed dose if the electrons are completely absorbed in 216 g of tissue? radarrow_forward
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