题目内容

Iodine-123, iodine-124, and iodine-125 are radioactive isotopes of iodine (atomic number Z = 53). How many neutrons does iodine-124 have?

A. 71
B. 70
C. 72

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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).

A. a) stable.
B. b) chemically pure.
C. c) sterile and pyrogen free.