Packet L: Tossup 9

The source is precisely positioned such that the position of one of these objects corresponds to the on-axis spread-out Bragg peak of a depth–dose curve. One of these objects is scanned layer by layer in pencil-beam scanning, which like the related IMRT, requires knowledge of the 3D structure of these objects. The RF acceleration of electrons into tungsten generates X-rays on the order of 10 MeV (“M-E-V”) that are then fired at these objects. These objects are typically subject to total dosages of about 50 gray, (-5[1])split (10[1])into fractions of 2 (10[1])gray. (10[1]-5[1])The application of external beam radiation to these objects is the primary application (10[1])of linear accelerators nowadays. (10[1])Highly (10[1])radiosensitive examples of these objects include seminomas (10[3])and lymphomas. (10[19]-5[1])For (10[3])10 points, (10[5])name these malignant (10[3])masses (10[3])of cells (10[3])that are treated (10[2])using (10[1])radiotherapy. (10[1])■END■ (10[2])

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