Which statement is false concerning source to axial distance treatment techniques?

Which of the following components of the linear accelerator are not located in the gantry head?

Beam gantry angle and portal shape is mostly determined

Which of the following lymph nodes groups are part of the external iliac node chain? 

All of the following statements about the definition of monitor units is true except

A patient has been prescribed a total dose of 72 Gy to be delivered in fractionated doses of 2 Gy. What is the patient’s total dose equivalent?

When discussing the 4R’s of radiobiology, which concept applies to the cancer/tumor?  

If a field size measures 15 cm x 20 cm at a distance of 80 centimeters from the radiation source, what will the field size be at a distance of 95 centimeters?

The thoracic duct starts at the level of L-2 as the 

Fractionated radiation therapy doses allow for