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5 Cards in this Set
- Front
- Back
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1. How does Tl 201 decay?
a. by positron emission b. by electron capture c. by beta emission d. none of the above |
b
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2. What is the role of the stannous ion in the preparation of pharmaceuticals labeled with 99mTc?
a. to increase the valence state from +4 to +7 b. to reduce the amount of Al3+ present c. to reduce the valence state of 99mTc d. to reduce the radiation dose |
c
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3. If an assay of a vial containing 131I shows 50 mCi present on May 2, appoximately what will the assay show on May 18?
a. 25 mCi b. 12.5 mCi c. 40 mCi d. 6 mCi |
b
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4. If a bone scan has been ordered on a 5 yr old girl, and the physician precribes 62% of the adult dose given, how many mCi should be administered?
a. 21.7 b. 12.4 mCi c. 7.4 mCi d. 3.1 mCi |
b
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5. If the biological half-life of an isotope is 6 hrs, and the physical half life is 12 hrs, what is the effective half-life?
a. 6 hrs b. 12 hrs c. 2 hrs d. 4 hrs |
d
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