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Radiochromic films need to be stored in a dry and dark environment.

The buildup caps that are used when measuring exposure for higher energy beams are usually made out of lead. 

Which of the following is the light sensitive material contained in radiographic film emulsion?

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.