About
As the President Director of Carro Indonesia, I lead the operations and growth of the…
Activity
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I will be representing Aliena Pte Ltd at the upcoming Small Satellite Conference (SmallSat) on the 3rd - 8th August 2024 in Logan, Utah…
I will be representing Aliena Pte Ltd at the upcoming Small Satellite Conference (SmallSat) on the 3rd - 8th August 2024 in Logan, Utah…
Liked by Bryan Tan, PhD
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Met with Indonesia's Minister of Administrative and Bureaucratic Reform Abdullah Azwar Anas last week. We had a fruitful discussion on digital…
Met with Indonesia's Minister of Administrative and Bureaucratic Reform Abdullah Azwar Anas last week. We had a fruitful discussion on digital…
Liked by Bryan Tan, PhD
Experience
Education
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University of Cambridge
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PhD in Earth Science, Wolfson College
Academic Supervisor: Prof. Ian Farnan
Research Project: Alteration of Spent Nuclear Fuel with HPC Computations and Simulations -
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Activities and Societies: Postgraduate Diploma in Education - mandatory requirement for teaching in Singapore schools. - useful in lesson plans, lesson management, education scaffolding. - specialises in sciences and maths.
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Activities and Societies: Accelerated Honours in NUS Faculty of Science.
Licenses & Certifications
Publications
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An Atomic-Scale Understanding of UO2 Surface Evolution during Anoxic Dissolution
ACS Applied Materials & Interfaces
Tan, B. T., Popel, A. J., et al. (2019) ‘Surface and electrochemical controls on UO2 dissolution under anoxic conditions’, Journal of Nuclear Materials. Elsevier B.V, 520, pp. 41–55.
doi: 10.1016/j.jnucmat.2019.03.047.
Our present understanding of surface dissolution of nuclear fuels such as uranium dioxide (UO 2) is limited by the use of non-local characterization techniques. Here we discuss the use of state-of-the-art scanning transmission electron microscopy (STEM) to reveal…Tan, B. T., Popel, A. J., et al. (2019) ‘Surface and electrochemical controls on UO2 dissolution under anoxic conditions’, Journal of Nuclear Materials. Elsevier B.V, 520, pp. 41–55.
doi: 10.1016/j.jnucmat.2019.03.047.
Our present understanding of surface dissolution of nuclear fuels such as uranium dioxide (UO 2) is limited by the use of non-local characterization techniques. Here we discuss the use of state-of-the-art scanning transmission electron microscopy (STEM) to reveal atomic-scale changes occurring to a UO 2 thin film subjected to anoxic dissolution in deionised water. No amorphisation of the UO 2 film surface during dissolution is observed, and dissolution occurs preferentially at surface reactive sites that present as surface pits which increase in size as the dissolution proceeds. Using a combination of STEM imaging modes, energy-dispersive X-ray spectroscopy (STEM-EDS), and electron energy loss spectroscopy (STEM-EELS), we investigate structural defects and oxygen passivation of the surface that originates from the filling of the octahedral interstitial site in the centre of the unit cells and its associated lattice contraction. Taken together, our results reveal complex pathways for both the dissolution and infiltration of solutions into UO 2 surfaces.Other authors -
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Alteration Mechanisms of Spent Nuclear Fuel and Characterization of Potential Uranium Secondary Phases
University of Cambridge
Tan, B. T. (2020). Alteration mechanisms of spent nuclear fuel and characterization of potential uranium secondary phases. (Doctoral thesis). https://doi.org/10.17863/CAM.51310
This research thesis progresses along two pathways, alteration of spent nuclear fuel and identification of said alteration. The relative abundance of uranium as an energy resource, coupled with the high costs of spent nuclear fuel reprocessing and the associated risks of nuclear proliferation make a strong case…Tan, B. T. (2020). Alteration mechanisms of spent nuclear fuel and characterization of potential uranium secondary phases. (Doctoral thesis). https://doi.org/10.17863/CAM.51310
This research thesis progresses along two pathways, alteration of spent nuclear fuel and identification of said alteration. The relative abundance of uranium as an energy resource, coupled with the high costs of spent nuclear fuel reprocessing and the associated risks of nuclear proliferation make a strong case for direct disposal of SNF in deep underground geological disposal facilities. The escape of radionuclides from underground spent nuclear fuel disposal facilities will likely result from anoxic dissolution of spent nuclear fuel by intruding groundwater with potential high alpha radioactivity even after hundreds of years. Considering the lack of oxygen at repository depths of 500 m to few km below the Earth, anoxic dissolution experiments with uranium dioxide in various solid forms was conducted to investigate secondary phases formation, the escape of radioactivity in the form of dissolved uranium and electrochemistry evolution to understand the redox changes happening in the surface and solution of our experiments due to the interaction of water and spent nuclear fuel. The other research thrust in this thesis is the analysis of potential secondary phases via non-destructive scientific techniques such as scanning electron microscopy (SEM), energy dispersive x-ray analysis (EDX), electron- backscattered diffraction (EBSD), X Ray Diffraction (XRD), Raman spectroscopy with a chapter dedicated on 17O NMR. For the latter, given the long alteration timeline for uranium dioxide, it is challenging to achieve sufficient alteration products for analysis within a short 4-year PhD program. -
Surface and Electrochemical Controls on UO2 Dissolution Under Anoxic Conditions
Journal of Nuclear Materials
Tan, B. T., Popel, A. J., et al. (2019) ‘Surface and electrochemical controls on UO2 dissolution under anoxic conditions’, Journal of Nuclear Materials. Elsevier B.V, 520, pp. 41–55.
doi: 10.1016/j.jnucmat.2019.03.047.
The escape of radionuclides from underground spent nuclear fuel disposal facilities will likely result from anoxic dissolution of spent nuclear fuel by intruding groundwater. Anoxic dissolution of various forms of uranium dioxide (UO2), namely bulk pellet, powder and…Tan, B. T., Popel, A. J., et al. (2019) ‘Surface and electrochemical controls on UO2 dissolution under anoxic conditions’, Journal of Nuclear Materials. Elsevier B.V, 520, pp. 41–55.
doi: 10.1016/j.jnucmat.2019.03.047.
The escape of radionuclides from underground spent nuclear fuel disposal facilities will likely result from anoxic dissolution of spent nuclear fuel by intruding groundwater. Anoxic dissolution of various forms of uranium dioxide (UO2), namely bulk pellet, powder and thin film, has been investigated. Long-duration static batch dissolution experiments were designed to investigate the release of uranium ions in deionized water and any surface chemistry that may occur on the UO2 surface. The dissolved uranium concentration for anoxic dissolution of nearly stoichiometric UO2 was found to be of the order of 10−9 mol/l for the three different sample types. Further, clusters (∼500 nm) of homogenous uranium-containing precipitates of ∼20–100 nm grains were observed in thin film dissolution experiments. Such a low solubility of UO2 across sample types and the observation of secondary phases in deionized water suggest that anoxic UO2 dissolution does not only occur through a U(IV)(solid) to U(VI)(aqueous) process. Thus, we propose that dissolution of uranium under anoxic repository conditions may also proceed via U(IV)(solid) to U(IV)(aqueous), with subsequent U(IV) (precipitates) in a less defective form. Quantitative analysis of surface-sensitive EBSD diffractograms was conducted to elucidate lattice-mismatch induced cracks observed in UO2 thin film studies. Variable temperature anoxic dissolution was conducted, and no increased uranium concentration was observed in elevated temperatures.Other authors -
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Surface Alteration Evidence for a Mechanism of Anoxic Dissolution of UO2
Applied Surface Science.
Popel, A. J., Tan, B. T., et al. (2019) ‘Surface alteration evidence for a mechanism of anoxic dissolution of UO2’, Applied Surface Science. Elsevier, 464(August 2018), pp. 376–379. doi:/10.1016/j.apsusc.2018.09.094.
A secondary phase has been observed to nucleate on the surface of UO2 in a solution with uranium concentration values of ∼10-9 mol/l. The UO2 was in the form of a 100 nm single crystalline film of UO2 epitaxially deposited on the (001) surface of a single crystalline silicon…Popel, A. J., Tan, B. T., et al. (2019) ‘Surface alteration evidence for a mechanism of anoxic dissolution of UO2’, Applied Surface Science. Elsevier, 464(August 2018), pp. 376–379. doi:/10.1016/j.apsusc.2018.09.094.
A secondary phase has been observed to nucleate on the surface of UO2 in a solution with uranium concentration values of ∼10-9 mol/l. The UO2 was in the form of a 100 nm single crystalline film of UO2 epitaxially deposited on the (001) surface of a single crystalline silicon substrate. An extended (140 days) dissolution experiment with UO2 in contact with a solution in deoxygenated, deionised water, under an Ar atmosphere (∼0.1 O2 ppm) at ambient temperature (∼25 °C) suggests that uranium dioxide should dissolve and precipitate while remaining in the U4+ oxidation state to enable nucleation of a low solubility secondary phase. A mechanism for the anoxic dissolution of UO2 in deionised water is proposed that involves U4+ dissolution at defect sites that subsequently nucleate and precipitate in a less defective form.Other authors -
Projects
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National Engineer’s Day
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Presentation: Ionising radiation and its detection
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Uranium Science Conference, Bristol
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Presentation: Surface alteration mechanism for anoxic uranium dioxide dissolution
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Spent Nuclear Fuel Workshop, Sheffield, UK
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Presentation: Microstructural precipitates detected in anoxic UO2 dissolution
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Goldschmidt 2017, Paris, France
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Presentation: Development of Solid State MAS-NMR techniques for characterization
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MRS Scientific Basis for Nuclear Waste Management, Sydney, Australia
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Presentation: Solid State MAS-NMR for characterizing uranium minerals produced during dissolution of spent nuclear fuel
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Malaysia- Singapore Research Conference, Cambridge, UK
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Presentation: Policy Developments in Nuclear Energy
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Malaysia- Singapore Research Conference, Cambridge, UK
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Presentation: Spent Nuclear Fuel Alteration
Honors & Awards
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Sunrise Award -ASEAN Top Data Talents
Centre of Applied Data Science
CADS Sunrise Award aims to honor rising stars who are creating a positive impact in data science, analytics, and AI (Artificial Intelligence) fields. This annual award will set an industry standard for top young data talent hallmark in this region in the coming years.
https://blog.cads.ai/16-asean-youth-listed-as-top-data-talent-in-cads-sunrise-award/ -
Cambridge Philosophical Society Scholarship
Cambridge University
- Scholarship for outstanding research work supported with references from supervisor and tutor.
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Wolfson College City Scholarship
Wolfson College, Cambridge University
- Scholastic award to support research work funded by Wolfson College alumni to further noteworthy research.
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Singapore Nuclear Research and Safety Initiative Full Scholarship
Singapore Nuclear Research and Safety Initiative
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Public Service Commission Scholarship
Public Service Commission
Organizations
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Society of Medical Physicists (Singapore)
Fellow
- PresentToday, medical physicists play an integral role in improving the quality of health care delivery around the world, ensuring patient safety in radiation medicine by so that each patient receives the optimal radiation dose for diagnostic or treatment purposes.
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Geological Society of London
Member
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The Oxford and Cambridge Society of Singapore
Member
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Institute of Physicists Singapore
Member
- Present
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