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Cancer cells are more vulnerable to x and gamma radiation than are healthy cells. In the past, the standard source for radiation therapy was radioactive ""^(60)Co, which decays, with a half-life of 5.27 y, into an excited nuclear state of ""^(60)Ni. That nickel isotope then immediately emits two gamma-ray photons, each with an approximate energy of 1.2 MeV, How many radioactive ""^(60)Co nuclei are present in a 6000 Ci source of the type used in hospitals? (Energetic particles from linear accelerators are now used in radiation therapy.) |
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