30.25.Set Up:For x rays,and for protons Sv measures equivalent dose.Solve: (a)Since they have a large RBE, a proton beam requires a smaller absorbed dose for the same equivalentdose. So, use a proton beam.since (b)and Reflect:Protons have a greater biological effect than x rays, if the same amount of energy is delivered to the tissueby each.30.26.Set Up:Solve: (a)so 0.25 mSv corresponds to 0.25 mGy. (b)so and 10 mrem(c)30.27.Set Up:For x rays so the equivalent dose in Sv is the same as the absorbed dose in Solve:One whole-body scan delivers One chest x ray delivers It takes chest x rays to deliver the same total energy.30.28.Set Up:For protons,For alpha particles,Solve: (a)(b)The absorbed energy is Eachproton has energy The number of protons absorbed is the energy absorbed divided by the energy of one proton:(c)This is one-fourth the absorbed energy inpart (b), so the number of alpha particles absorbed is 30.29.Set Up:For x rays and the equivalent dose equals the absorbed dose.
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