About Bragg peak effect of protons all are true except:
Electromagnetic radiation
Produce ionization in biological system
The dose of a single beam is two to four times greater than the path dose
Beam therapy for AV malformation of the brain
Ref. Grainger and Allison's Diagnostic Radiology. Page. 30
 
Bragg Peak

The Bragg peak is a pronounced peak on the Bragg curve which plots the energy loss of ionizing radiation during its travel through matter.
For protons, α-rays, and other ion rays, the peak occurs immediately before the particles come to rest