The isotope 99tc is commonly used in several different, Ask an Expert

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The isotope ^(99)Tc* is commonly used in several different types of medical imaging procedures. It emits a 140-keV gamma ray (comparable to the energies of diagnostic x rays) and has half-life 6.01 h.

A. What's the change in the nuclear mass after emission of the gamma ray?

B. What's the activity of 0.62micrograms of ^(99)Tc* injected into a patient?

C. How much of ^(99)Tc* remains after one week?

D. How much of ^(99)Tc* remains after 30 days?

Note: ^(99) is to indicate the 99 is superscript (an isotope)

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