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Why is water often used as a phantom material?

Dmax is defined as the depth of maximum dose for a single photon beam and is most dependent on beam energy. 

The point of maximum dose for megavoltage beams is at the skin surface.

Percent depth dose is dependent on:

The ratio of the dose at depth in tissue to the dose at dmax on the beam axis is known as:

A tumor is treated using an AP field with a high-energy photon beam. The tumor is located at a depth of 6 cm where the percent depth dose is 78.4%. The spinal cord is in the path of the beam and Is located at a depth of 14 cm where the percent depth dose is 35.3%. If 200 cGy is delivered to the tumor, calculate the dose delivered to the spinal cord.

Bragg-Gray cavity theory is used to calculate absorbed dose for any type of radiation. 

Every solid-state system needs to be calibrated in a known radiation field before it can be used for the measurement of absorbed dose. 

The radiation therapy badge that you will wear in clinic uses the principle of:

1 Gy = _____.