refer to the following: A collimator is a device used in

Chapter 6, Problem 80

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refer to the following: A collimator is a device used in radiation treatment that narrows beams or waves, causing the waves to be more aligned in a specic direction. The use of a collimator facilitates the focusing of radiation to treat an affected region of tissue beneath the skin. In the gure, ds is the distance from the radiation source to the skin, dt is the distance from the outer layer of skin to the targeted tissue, 2fs is the eld size on the skin (diameter of the circular treated skin) and 2fd is the targeted eld size at depth dt (the diameter of the targeted tissue at the specied depth beneath the skin surface).Health/Medicine. Radiation treatment is applied to a eld size on the skin of 4.15 centimeters to reach an affected area lying 4.5 centimeters below the skin surface. If the treatment head is positioned 60 centimeters from the skin surface, nd the eld size of the targeted area to the nearest millimeter.