题目内容

以下选项正确的是

A. 1
B. 2
C. 3
D. 4

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A. 71
B. 70
C. 72

A. Fluorine-19.
B. Oxygen-18.
C. Boron-11.

A. a) Undesired chemical compounds present.
B. b) Free or unlabeled radioisotope present.
C. c) Undesired radioisotopes present.

A. a) Gamma Spectroscopy.
B. b) High Performance Liquid Chromatograpy (HPLC).
C. c) Thin Layer Chromatography (TLC).