Round 4: 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, split into fractions of 2 gray. The application of external beam radiation to these objects is the primary application of linear accelerators nowadays. Highly radiosensitive examples of these objects include seminomas (10[1])and lymphomas. (10[2])For (10[1])10 points, name these malignant masses of cells (10[1])that are treated using radiotherapy. ■END■

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