A drug (-ls) contains the radioactive source 99TC (half-life = 6.05 h) is prepared for a patient. If the activity of this radioactive source is 7.05 Ci, then its mass (in micrograms) is closest to: (Recall that 1 Ci = 3.7 x 1010 Bq and NA = 6.022 x 1023) 3.1 x105 0.02 9.7 0.67 O 1.35
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