In radiation therapy,which of the following refers to materials whose interactions with the radiation beam mimic those of tissue?

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In radiation therapy,bolus refers to material whose interactions with the radiation beam mimic those of tissue.The purpose of a bolus is to compensate for variation in surface contour or to eliminate air gaps in cavities.Thus,it brings the area of maximum dose deposition to the patient's surface.

In Radiation Therapy,which of the Following Refers to Materials Whose