Broadband X-ray edge-enhancement imaging of a boron fibre on lithium fluoride thin film detector
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- 作者：E. Nichelattia ; enrico.nichelatti@enea.it" class="auth_mail" title="E-mail the corresponding author ; F. Bonfiglib ; M.A. Vincentib ; A. Ceciliac ; P. Vagovičd ; T. Baumbachc ; R.M. Monterealib
- 关键词：Radiation detectors ; X-rays ; X-ray edge-enhancement imaging ; Lithium fluoride ; Colour centres ; Photoluminescence
- 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
- 出版年：2016
- 出版时间：11 October 2016
- 年：2016
- 卷：833
- 期：Complete
- 页码：68-76
- 全文大小：965 K
文摘
The white beam (∼6–80 keV) available at the TopoTomo X-ray beamline of the ANKA synchrotron facility (KIT, Karlsruhe, Germany) was used to perform edge-enhancement imaging tests on lithium fluoride radiation detectors. The diffracted X-ray image of a microscopic boron fibre, consisting of tungsten wire wrapped by boron cladding, was projected onto lithium fluoride thin films placed at several distances, from contact to 
. X-ray photons cause the local formation of primary and aggregate colour centres in lithium fluoride; these latter, once illuminated under blue light, luminesce forming visible-light patterns—acquired by a confocal laser scanning microscope—that reproduce the intensity of the X-ray diffracted images. The tests demonstrated the excellent performances of lithium fluoride films as radiation detectors at the investigated photon energies. The experimental results are here discussed and compared with those calculated with a model that takes into account all the processes that concern image formation, storing and readout.
. X-ray photons cause the local formation of primary and aggregate colour centres in lithium fluoride; these latter, once illuminated under blue light, luminesce forming visible-light patterns—acquired by a confocal laser scanning microscope—that reproduce the intensity of the X-ray diffracted images. The tests demonstrated the excellent performances of lithium fluoride films as radiation detectors at the investigated photon energies. The experimental results are here discussed and compared with those calculated with a model that takes into account all the processes that concern image formation, storing and readout.