Light Collection Enhancement Analysis for Digital X-Ray Detector Using Gd2O2S:Tb and CsI:Tl Phosphors in Nanoscale Treatment - Atomic Nanoscale Technology in the Nuclear Industry - page 69

The.simulation.of.photon.detection.for.the.two.geometrically.deined.cases.
of.microlenses.attached.to.photodetectors.is.investigated.in.this.chapter..The.
method.is.examined.in.Section.6.2,.results.are.provided.in.Section.6.3,.and.
Section.6.4.includes.conclusions.

6.2 Method
It.is.important.to.enhance.the.quality.of.imaging.by.optical.apparatus..The.
investigation. is. done. to. develop. an. x-ray. detector. design. including. micro-
lens.arrays.that.are.optimized.for.the.AMFPI.photodetector..It.is.necessary.
to. measure. the. transmittance,. focusing,. and. uniformity. of. the. microlens.
arrays.(Petrick.2001,.2002)..The.system.coniguration.for.this.simulation.is.in.
Figure 6.2.where.the.size.of.the.coniguration.is.in.micrometers..Figure 6.3.
shows. light. dispersion. by. the. screens. (Hamamatsu. 1996).. The. solid. line.
shows.the.light.dispersion.of.CsI.and.the.dotted.line.is.the.light.dispersion.of.

P2 P3

P1

L2

L1

50 µm

X-Ray

23 µm

P7 P6 P5

Screen Microlens Photodetector Top View of Photodetector (Center: P8,P9,P4)

FIGURE 6.2
Simpliied.imager.coniguration.

FIGURE 6.3
Modeling.of.light.dispersion.between.CsI.(solid.line).and.Gd 2 O 2 S.(dotted.line).phosphors.