|Hard X-Ray and Gamma-Ray Detectors for High Energy Astronomy|
|Back illuminated detectors and SDDs equally exhibit excellent properties in the optical bandwidth. If coupled to scintillators they can measure the amount of the incident light and if pixelated, the spatial intensity distribution. The low noise amplification allows for an energy resolution solely limited by the photon statistics of the light generation and collection processes in the scintillator.||
A scintillator is coupled to a light sensitive silicon drift detector with the help of optical grease. The SDD is subdivided in individual cells, each equipped with an on-chip amplifier.
|Both low noise amplification
and high quantum efficiency in the optical make silicon drift detectors
suitable for the light detection of scintillators, e.g. CsI(Tl) or
LaBr3. The segmentation of the SDDs in
subunits of tens of square millimeters allows for a precise reconstruction
of the light centroid of the incident X-rays and hence a space point
measurement of the position of the interaction within the scintillating
crystal (figure on the right). The described technique was used
to proof the principle of a hard X-ray camera operational in astrophysics
as well as in medical application.
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