Introduction To Health Physics
Introduction To Health Physics
5th Edition
ISBN: 9780071835275
Author: Johnson, Thomas E. (thomas Edward), Cember, Herman.
Publisher: Mcgraw-hill Education,
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Chapter 5, Problem 5.39P
To determine

The activity in becquerels and in microcuries.

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In a nuclear medicine scan with 99mTc (t/2 = 6hrs), the signal-to-noise ratioImage size for a 30 min scan was 50: 1 with an injected radioactive dose of1 mCi (3.7x107 decays per second). Assume images startedimmediately after injection. If the scan time was doubled to 60minutes with a starting dose of 1 mCi, what would the SNR value of the image now be?
A reactor is developing nuclear energy at a rate of 32000 kW. How many atoms of Uranium U235 undergo fission per second? How many kilogram of U 235 would be used up in 500 hours of operation? Assume the average energy of 200 MeV released per fission. Take Avogadro’s number 6x1023 and 1 MeV = 1.6x10-13 joule.
The radionuclide 32P (T1/2 = 14.28 d) is often used as a tracer to follow the course of biochemical reactions involving phosphorus. (a) If the counting rate in a particular experimental setup is initially 3050 counts/s, how much time will the rate take to fall to 170 counts/s? (b) A solution containing 32P is fed to the root system of an experimental tomato plant, and the 32P activity in a leaf is measured 3.48 days later. By what factor must this reading be multiplied to correct for the decay that has occurred since the experiment began?
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