Very high-energy electron beams act similarly to low-energy photon beams with one major disadvantage. What is this disadvantage?

The half-life of Cesium-131 is:

How much bolus is needed to completely eliminate the skin sparing effect of a 10 MV photon beam?

Calculate the equivalent square for a 6.5 cm x 17 cm field.

A batch of Iodine-125 seeds is shipped to a hospital with an activity of 790 mCi. The seeds are received 8 days after they were shipped. What is the activity upon reception? 

Referring to the question above, calculate the object to film distance if the film is located 140 cm from the source.

A guide for determining the needed electron beam energy (in MeV) if prescribing to the 80% isodose line is to:

A wedge may:

A left sided breast cancer is being treated with tangential fields with a hinge angle of 180 degrees. If the gantry angle for the medial tangent is 310 degrees, what is the gantry angle for the lateral tangent?

A patient is treated on the 6-MV linear accelerator at 122 cm SSD. The collimator setting is 18 x 18 cm and the field size on the patient’s skin is 23 x 23 cm. The prescription calls for a dose of 150 cGy to be administered to a depth of 10 cm with a single anterior field. Calculate the MU setting with the use of PDD.