Читать книгу Essentials of Nuclear Medicine Physics, Instrumentation, and Radiation Biology - Rachel A. Powsner - Страница 73

1 (e) None of the above: (a) the parent half‐life is always longer than the daughter half‐life; (b) if the half‐life of the parent is between 10 and 100 times greater than the half‐life of the daughter, the activity curve is downward sloping and the equilibrium is termed “transient”; and (c) the daughter nuclide is less tightly bound, thereby it can be removed or eluted for use.

2 True.

3 (b) The half‐life of the parent nuclide, 82Sr, is more than 100 times that of the daughter nuclide, 82Rb.

4 (a), (b), (c), (e), (f), (k) are terms for reactors; (d), (f) are terms for cyclotrons; (g), (h), (i), (j) are terms for generators.

5 (a) 1; (b) 1; (c) 2; (d) 3.

6 (b) In a cyclotron.

7 (c) and (d).

8 (a) In a generator.

9 (b) 31 mCi. Since only 86% of the 99Mo decays to 99mTc the original amount of 99Mo or A(0) = 100 mCi and t = 96 hours and T1/2 = 66 hours.Since only 86% of 99Mo decays to 99mTcThis calculation can be simplified by using the A(0) for 99mTc combined with the T1/2 of 99Mo: