A proton profile monitor using an amorphous silicon photodiode array

An amorphous silicon photodiode array originally manufactured for facsimile has been applied to an imaging system for proton beam measurements. A Gd/sub 2/O/sub 2/S phosphor sheet and a CsI(Tl) scintillator strip for proton-to-light conversion were tested to obtain good sensitivity. Proton depth dose distribution measurements for cancer therapy are presented.<>