Physics Bucharest 2017

Summary of point dose detectors

Dosimeter Advantages

Disadvantages

Diode

High intrinsic precision High sensitivity Real time dose information Simple read-out Small sensitive volume Small physical size Real time dose information Neglectible beam perturbations Energy independent Small volume Cheap Long life-time Neglectible beam perturbations

Energy dependant Temperature dependant Corrections for SSD, Field size, Wedge etc Limited life-time Limited intrinsic precision

(micro) MOSFET

No real time dose information Limited intrinsic precision Signal erased during read-out Easy to lose Accurate result require care

TLD

Adapted from thesis of E.Bloemen- van Gurp: “In vivo dosimetry using MOSFET detectors in radiotherapy