A sample containing only the isotope 99Mo undergoes radioactive decay as shown: 99Mo (t1/2 = 65 h) — Nuclear Chemistry Chemistry Question
Question
A sample containing only the isotope 99Mo undergoes radioactive decay as shown:
99Mo (t1/2 = 65 h) 99mTc (t1/2 = 6 h) 99Tc
Which of the following statements about the relative activity of 99Mo and 99mTc in the sample is correct?
A.
The activity of 99mTc exceeds that of the 99Mo after about 20 h.
B.
The activity of 99mTc exceeds that of the 99Mo after about 120 h.
C.✓ Correct
The activity of 99mTc becomes roughly equal to that of the 99Mo after about 20 h.
D.
The activity of 99mTc becomes roughly equal to that of the 99Mo after about 120 h.
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