The present article briefly reports radiation detectors which have been used for the proton therapy at Proton Medical Research Center (PMRC), Universi ty of Tsukuba. 1. BDEt:
(a) A TypicalTreatment Setup at the Vertical Beam Line <---+ ri- rz\ i N[[[[NU[ I i Energy Fine Degrader Ridse Filter,.lonization Chamber(lC) Beam Monitor { :=3!= --- \ Secondary Emission i { chamber(sec) rir I rlr Botus -_41ri Final Collimator n;v7777tvzl Block collimator (b) Relative Dose Distribution Measurement Water Phantom (c) Monitor (lc,sec) Calibration JARP
t6 - R1(C6 + Cr) ln{(vr-vd)/v.}
PEton Dos to Watar Upp.a llmlt of lh. rc{nncr
Spot 1 : Horlzr Spot 2 : Verdr