What is the range in water for 6 MeV electron beams?

The correct choice indicates that the range in water for 6 MeV electron beams is approximately 3 cm. This value is based on the general characteristic of electron beams, which deposit their energy and interact with matter (or water, in this context) primarily through ionization.

In radiotherapy, the range of electron beams is dependent on their energy. As the energy of the electron beam increases, so does the range in water. A 6 MeV electron beam typically penetrates to a depth of about 3 cm in water, which corresponds to the energy reduction and interaction properties of electrons in tissue-like media.

The range is essential for medical dosimetry, as it helps determine the appropriate dose distribution necessary for treating tumors while sparing surrounding healthy tissue. Understanding this range aids in planning treatment methods effectively. Therefore, recognizing that the range for 6 MeV electrons is about 3 cm provides critical information for practitioners in the field.