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

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

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 dose to air is found to be 1.2 Gy. What is the exposure?

The point of maximum dose is referred to as:

100 rads = 100 cGy.  

If the percent depth dose at a depth of 5 cm using a 6 MV beam (Dmax = 1.5 cm) at an SSD of 100 cm is 77.5%, what is the percent depth dose at the same depth if the SSD is extended to 110 cm?

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

Absorbed dose is maximum at the surface. 

Field size may be defined geometrically or dosimetrically; geometric field size typically corresponds to the field as defined by the field light while the dosimetric field size corresponds to the 50% isodose line.