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Homework II - Radiation Decay

  1. A dose of 131I arrived today and is calibrated for 12N 2/01/07.  Its quantity is 175 mCi. On 1/30/07 at 3PM, how much activity does Gabadale have?   On 2/17/07 at 12N how much activity is available?











  2. Samerizer started a linearity started several days ago with 155.7 mCi of activity.  Today the amount is 153 μCi.  How much time has transpired?



  3. The Austan from Bostan eluted 1098 mCi in 5 mL at 8 AM today.  If there is 2.5 mL remaining in the vial at 5 PM, how much activity do you have?




  4. Help Chem-chem-ery figure out the radionuclide being used if you know that the original activity was 7.8 mCi and 92 hours later 3.4 mCi remain?




  5. If the physical T1/2 is 13 hours and the biological is 6.5 hours then what is the effective T1/2?





  6. Yesterday Hahn-a-Day had 2.5 mCi of 57Co.  How much remains 2 years from now?




  7. What is the biological T1/2 if the physical is 2 days and effective is 1.34 days?




  8. Yesterday at high noon Sara and her hubby noticed a 99mTc/99Mo generator just hanging there in the middle of a corn field.  Curiosity got the better of them so they decided to investigate. Because of Sara's knowledge in nuclear medicine she easly determined the calibration at 12N 14 days ago was 197 GBq. As the clock struck 11:00 AM what is the generator's current activity?

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