date: september 16, 2024

congratulations to anirudh on the successful defense of his msc thesis in physics. anirudh presented his work titled ‘evaluation of multi-angle imaging with planar organ-targeted positron emission tomography detectors‘ conducted under the supervision of dr. alla reznik. the reznik group wishes him all the best as he embarks on his phd studies.

congratulations once again!

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oleksandr g., oleksandr b., and alla reznik went to ghent, belgium to present a
comparative study on recombination of the x-ray generated charge in amorphous selenium (a-
se) and amorphous lead oxide (a-pbo) photoconductors. the joint conference they presented at
was the 9th international conference on optical, optoelectronic and photonic materials and
applications, and the 14th euro physical conference on defects in insulating materials
(icoopma-eurodim 2022). more information regarding the conference and other
presentations can be found here.

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oleksandr grynko and alla reznik published two chapters in the first volume of
photoconductivity and photoconductive materials: fundamentals, techniques and applications.
they were responsible for writing chapter eight and chapter sixteen.

chapter eight is called charge extraction by linearly increasing voltage (celiv) method for
investigation of charge carrier transport and recombination in disordered materials, and
discusses a modern technique used for finding charge mobility in a material. chapter 16
discusses progress in lead oxide x -ray photoconductive layers.

congratulations to you both on contributing to this book, and its recent publication.

full book can be found on wiley here.

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oleksandr grynko with co-authors: tristen thibault, emma pineau, and alla reznik
published a paper titled “the x-ray sensitivity of an amorphous lead oxide photoconductor” in
special issue: sensors and x-ray detectors. congratulations on the published paper!

abstract

the photoconductor layer is an important component of direct conversion flat panel x-ray
imagers (fpxi); thus, it should be carefully selected to meet the requirements for the x-ray
imaging detector, and its properties should be clearly understood to develop the most optimal
detector design. currently, amorphous selenium (a-se) is the only photoconductor utilized in
commercial direct conversion fpxis for low-energy mammographic imaging, but it is not
practically feasible for higher-energy diagnostic imaging. amorphous lead oxide (a-pbo)
photoconductor is considered as a replacement to a-se in radiography, fluoroscopy, and
tomosynthesis applications. in this work, we investigated the x-ray sensitivity of a-pbo, one of
the most important parameters for x-ray photoconductors, and examined the underlying
mechanisms responsible for charge generation and recombination. the x-ray sensitivity in terms
of electron–hole pair creation energy, w±, was measured in a range of electric fields, x-ray
energies, and exposure levels. w± decreases with the electric field and x-ray energy, saturating
at 18–31 ev/ehp, depending on the energy of x-rays, but increases with the exposure rate. the
peculiar dependencies of w± on these parameters lead to a conclusion that, at electric fields
relevant to detector operation (~10 v/μm), the columnar recombination and the bulk
recombination mechanisms interplay in the a-pbo photoconductor.

continue reading the article: https://doi.org/10.3390/s21217321

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dr. alla reznik is receiving $68,407 from the canada foundation for innovation. this
money will go to manufacture large-area detector prototypes for medical use, these which use the
new photoconductor material amorphous lead oxide.

dr. reznik is one of three researchers from 阿根廷vs墨西哥竞猜 and tbrhri to be receiving
money from the canada foundation for innovation. they will be receiving more than $244,000
from the canada foundation for innovation. more can be found here.

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congratulations to oleksandr grynko for winning the graduate studies research
excellence award in the nserc category. oleksandr is a phd student in chemistry and
material science doing his research with alla reznik as a supervisor.

research and innovation week 2021 is held annually at 阿根廷vs墨西哥竞猜 . the awards are
given to commemorate the exceptional achievements of professors, partners, and 世界杯2022赛程表淘汰赛 . more
information regarding the other awards can be found here.

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dr. alla reznik was awarded a $205,000 grant for over five years from
canada’s natural sciences and engineering research council (nserc). this will be used to
examine lead oxide as its prospect for a more sensitive x-ray imaging detector. more
information can be found here.

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oleksandr grynko with co-authors: tristen thibault, emma pineau, and alla reznik
published a paper titled “engineering of a blocking layer structure for low-lag operation of
the a-pbo-based x-ray detector” in ieee transactions on electron devices (volume: 68,
issue: 5, may 2021). congratulations on the published paper!

abstract

direct conversion flat panel detectors are of great significance to the field of medical x-ray
imaging since they offer imaging performance and diagnostic capabilities not achievable with
other methods. currently, mammographic direct conversion detectors employ a layer of
amorphous selenium (a-se) photoconductor. although its properties ideally fit the requirements
of mammography, where “soft” x-rays are used, a-se cannot be used in high-energy x-ray
procedures. to extend the diagnostic capabilities of the direct conversion detectors, amorphous
lead oxide (a-pbo) is proposed as an alternative photoconductor. it is a high effective atomic
number material and thus has a higher x-ray stopping power over the wide x-ray energy range.
a-pbo is, therefore, a suitable candidate for applications in radiography, fluoroscopy, and digital
tomosynthesis. here, we report on the development of a blocking structure with a polyimide (pi)
layer needed to maintain low dark current at high electric fields. we demonstrate that a 1- μm-
thick pi blocking layer allows the operation of the detector at strong electric fields (≥10 v/ μm)
while suppressing the dark current to an innocuous level (<; 1 pa/mm 2 ). it also improves
temporal performance by reducing signal lag. no ghosting effect was observed at exposure rates
up to 1 r/s; however, at high radiation levels, the detector's sensitivity degraded. this
degradation is not permanent as the detector restores its original sensitivity after several hours of
rest in the dark without bias applied.

continue reading the article: https://doi.org/10.1109/ted.2021.3067616

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