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 60Co, which decays, with a half-life of 5.27 y, into an excited nuclear state of 60Ni.That nickel isotope then immediately emits two gamma-ray photons, each with an approximate energy of 1.2 MeV. How many radioactive 60Co 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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11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
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Chapter1: Units, Trigonometry. And Vectors
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Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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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 60Co, which decays, with a half-life of 5.27
y, into an excited nuclear state of 60Ni.That nickel isotope then immediately
emits two gamma-ray photons, each with an approximate
energy of 1.2 MeV. How many radioactive 60Co 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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