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Head of the Department of Physics- 
Dosimetry in diagnostic medical imaging procedures: Establishment of Diagnostic Reference Levels (DRLs)
Excellence in Teaching (Undergraduate Courses) for the academic years 2018/19, 2019/20 and 2020/21, Faculty of Science, University of Peradeniya, Sri Lanka.
Presidential Awards for Scientific Excellence (Sri Lanka) – Years 2007 and 2008
Member of Sigma pi Sigma, The National Physics Honor SocietyJournal of Radiological Protection
Sachith Welarathna, Velautham Sivakumar, Sivananthan Sarasanandarajah (2024).
DOI: https://doi.org/10.1088/1361-6498/ad3837
Radiation and Environmental Biophysics
Sachith Welarathna, Sivakumar Velautham and Sivananthan Sarasanandarajah (2024).
DOI: https://doi.org/10.1007/s00411-024-01080-5
Peer Reviewed, Full Paper 11th Young Scientists Forum (YSF) Symposium – 2023
W.D.S.D. Welarathna, V.Sivakumar, W. M. N. M. B. Wanninayake and S. Sarasanandarajah
(2023). Variations in patient doses
from lumbar spine x-ray examinations in two public hospitals in Sri Lanka. Peer Reviewed, Full Paper 11th Young Scientists Forum (YSF) Symposium – 2023, 2023: 347-350.
https://www.nastec.gov.lk/files/ysf_proceeding/Proceedings_11thYSFSymposium_2023_Final_Publish.pdf
Journal of Radiological Protection
Sachith Welarathna, Sivakumar Velautham, Sivananthan Sarasanandarajah, (2023). “Towards the
establishment of national diagnostic reference levels for chest X-ray
examinations in Sri Lanka: A multi-centric study” . Journal of Radiological Protection, .
DOI: https://doi.org/10.1088/1361-6498/acfc51
Journal of Applied Clinical Medical Physics
Sachith Welarathna, Sivakumar Velautham, Mihira Wanninayake, Sivananthan Sarasanandarajah (2022). Evaluation of patient
doses for routine digital radiography procedures toward establishing an
institutional diagnostic reference levels: A case study in Sri Lanka. Journal of Applied Clinical Medical Physics, 49 (4): 583-591.
DOI: https://aapm.onlinelibrary.wiley.com/doi/10.1002/acm2.13852
Journal Article in the Journal of the National Science Foundation of Sri Lanka
S. Mubarak, D. Nanayakkara, C. Jayalath, V. Sivakumar (2021). Low dose radioiodine therapy: A review of dosimetry and evaluation of potential shielding materials for neck collars. Journal Article in the Journal of the National Science Foundation of Sri Lanka, Vol 49, No 4: 583-591.
https://jnsfsl.sljol.info/jms/issue/view/794
Optik - International Journal for Light and Electron Optics
Deepalekshmi Ponnammaa, Velautham Sivakumar, Anton Popelka, Yasser H.A. Hussein , Mariam Al Ali Al-Maadeeda (2018). Laser induced periodic surface structures on nano metal oxide filled polyvinylidene fluoride nanocomposites. Optik - International Journal for Light and Electron Optics, 176: 372–383.
DOI: https://doi.org/10.1016/j.ijleo.2018.09.058
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
V. Sivakumar, D. Ponnamma and Yasser H.A Hussein, (2017). Photoinduced Electron Transfer Interaction of Anthraquinones with Aniline Quenchers: Influence of Methyl Substitution in Aniline Donors. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 173: 931–938.
RSC Adv.
Marwa S. Elazazy, K. Ganesh, V. Sivakumar, and Yasser H. A. Huessein, (2016). Interaction of p-Synephrine with p-Chloranil: Experimental Design and Multiple Response Optimization,. RSC Adv., 6: 64967-64976 .
Current Science
S. Wijeyamohan, V. Sivakumar, Bruce read, Dennis Schmitt, S. Krishnakumar and Charles Santiapillai, (2012). A simple technique to estimate linear body measurements of elephants. Current Science, 102: 26-28.
Journal of Photochemistry and Photobiology A: Chemistry
M.K.I. Senevirathne, P.K.D.D.P. Pitigala, V. Sivakumar, P.V.V. Jayaweera, A.G.U. Perera, K. Tennakone, (2008). Sensitization of TiO2 and ZnO nanocrystalline films with acriflavine. Journal of Photochemistry and Photobiology A: Chemistry, 195: 364-367.
Ceylon journal of Science; Physical Science
P.M. Sirimanne, M.K.I. Senevirathna, E.V.A. Premalal, P.K.D.D.P. Pitigala, V. Sivakumar, K. Tennakone, (2007). Utilization of cyaniding 3-glucoside as a sensitizer in a solid-state solar cell and enhancement of photo-properties of TiO2|cyanidin 3-glucoside|CuI cell by coupling mecurocrome with cyaniding 3-glucoside. Ceylon journal of Science; Physical Science, 12: 19-24.
Vibrational Spectroscopy
K.M. Priyangika Bandaranayake, Velautham Sivakumar, Ruili Wang and Gary Hastings, (2006). Modeling the A1 Binding Site in Photosystem I. Density Functional Theory for the Calculation of “Anion – Neutral” FTIR Difference Spectra of Phylloquinone,. Vibrational Spectroscopy, 42(1): 78-87 .
Journal of Photochemistry and Photobiology A: Chemistry
Sirimanne P.M, Senevirathna M.K.I, Premalal E.V.A, Pitigala P.K.D.D.P, Sivakumar V and Tennakone K, (2006). Utilization of Natural Pigment extracted from Pomegranate Fruits as Sensitizer in Solid State Solar Cells,. Journal of Photochemistry and Photobiology A: Chemistry, 177: 324-327 .
Biochemistry
Velautham Sivakumar, Ruili Wang and Gary Hastings (2005). A1 Reduction in Intact Cyanobacterial Photosystem I Particles Studied Using Time-resolved Step-scan Fourier Transform Infra-red Difference Spectroscopy and Isotope Labeling. Biochemistry, 44: 1880-1893.
in Photosynthesis: Fundamental Aspects to Global PerspectiVes (van der Est, A., and Bruce, D., Eds.)
Sivakumar, V. , Wang, R., Johnson, T., and Hastings, G (2005). A1 Reduction in Intact Cyanobacterial Photosystem I Studied Using Time-resolved Step-scan Fourier Transform Infrared Difference Spectroscopy in Combination with Site Directed Mutagenesis and Quinone Exchange Experiments. in Photosynthesis: Fundamental Aspects to Global PerspectiVes (van der Est, A., and Bruce, D., Eds.), Alliance Communications Group, Lawrence, KS: pp 59-60 .
Biochemistry
Yajing Li, Marie-Gabrielle Lucas, Tatyana Konovalova, Brian Abbott, Fraser MacMillan, Alexander Petrenko, Velautham Sivakumar, Ruili Wang, Gary Hastings, Feifei Gu, Johan van Tol, Louis-Claude Brunel, Russell Timkovich, Fabrice Rappaport and Kevin Redding, (2004). Mutation of the Putative Hydrogen-Bond Donor to P700 of Photosystem I. Biochemistry, 43: 12634-12647.
Biophysical Journal
Ruilli Wang, Velautham Sivakumar, T.Wade Johnson and Gary Hastings, (2004). FTIR Difference Spectroscopy In Combination With Isotope Labeling and Site Directed Mutagenesis for Identification of the Carbonyl Modes of P700 and P700+ in Photosystem I,. Biophysical Journal, 86: 1061–1073 .
Biophysical Journal
Velautham Sivakumar, Ruilli Wang, Gary Hastings; (2003). Photo-oxydation of P740, primary Electron Donor in Photosystem I From Acarychloris marina. Biophysical Journal, 85(5): 3162-3172.
Biochemistry
Ruili Wang, Velautham Sivakumar, Yajing Li, Kevin Redding and Gary Hastings, (2003). Mutation Induced Modulation of Hydrogen Bonding to P700 Studied Using FTIR Difference Spectroscopy. Biochemistry, 42: 9889-9897 .
Biochemistry
Gary Hastings, V. M. Ramesh, Ruilli Wang, Velautham Sivakumar, and Andrew Webber (2001). Primary Donor Photo-Oxidation in Photosystem I: A Re-Evaluation of (P700+ - P700) Fourier Transform Infrared Difference Spectra. Biochemistry, 40(43): 12943-12949.
Biochemistry
Gary Hastings and Velautham Sivakumar (2001). A Fourier Transform Infrared Absorption Difference Spectrum Associated with the Reduction of A1 in Photosystem I: Are Both Phylloquinones Involved in Electron Transfer?. Biochemistry, 40(12): 3681-3689.