Postdoc in Radiation Physics

tirsdag 03 nov 20

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Frist 25. november 2020
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DTU Physics is seeking candidates for a postdoctoral position in Radiation Physics to investigate the role of defects induced by ionising radiation in the fracturing of rocks and crystals.

The successful candidate will join the Radiation Physics section of DTU Physics. Radiation Physics carries out research and innovation in luminescence physics and neutronics, with applications within e.g. geological and archaeological dating, dosimetry and radiation protection, neutron scattering and nuclear energy. The division presently consists of approx. 30 people including researchers, technicians and PhD students.

Background
The advertised position is tied to a new project grant ‘Does Charge Movement in Minerals Drive Landscape Evolution? (CRACK) by the Villum Experiment Programme.


Fracturing and subsequent erosion of bedrock is the key geomorphic process that creates sediment and shapes landscapes; it thus plays a key role in the evolution of Earth’s ecosystems. The key question is what is the main cause of fracture in rocks and silicate minerals. Here we investigate whether and how the metastable states formed by capture or release of electrons from defects in crystal lattice trigger fracture propagation by the sub-critical cracking mechanism. The key result will be a new understanding of fracturing in rocks based on charge movement. While this research directly addresses the important field of landscape evolution, it will significantly impact areas as diverse as carbon and nuclear waste storage problem, fluid flow (oil and water), and predicting earthquakes.

The research brings together new ideas from three disparate disciplines (solid state physics, mechanical engineering and geoscience). It is largely of an exploratory nature with potential high gain and high risk.

Responsibilities and tasks
This inter-disciplinary project compares fracture mechanical properties, especially with respect to the sub-critical cracking, of both laboratory gamma irradiated and non-irradiated samples to characterise how electron trapping in the crystal defects affects the fracture propagation. Single crystals of major minerals (quartz, feldspar, olivine), and principal rock types (granite, quartzite, sandstone) will be studied.

The main experimental tasks consist of measuring (i) optically stimulated luminescence (OSL) and thermoluminescence (TL) signals in bulk and spatially resolved modes to characterize various properties related to the metastable states, and (ii) macroscopic crack growth rates using fracture mechanics tests e.g. wedge tests and microscale crack tip observations using an environmental scanning electron microscope. Modification of the current instrumentation configuration may be pursued if deemed necessary. The resulting data from luminescence and crack growth measurements will be correlated in order to explore the role of metastable states in rock fracture.

Qualifications
Candidates should have a PhD in physics, geophysics or mechanical engineering. Prior documented experience in solid state physics or solid mechanics or fracture mechanics testing & modelling would be an advantage. The candidate should have great self-motivation, the ability to work independently and to solve experimental challenges.


We offer
DTU is a leading technical university globally recognized for the excellence of its research, education, innovation and scientific advice. We offer a rewarding and challenging job in an international environment. We strive for academic excellence in an environment characterized by collegial respect and academic freedom tempered by responsibility.

We offer an exciting and challenging job in an international academic environment with excellent possibilities for professional and personal development. The successful candidate will work in an environment with activities and expertise within fundamental and applied research in the Radiation Physics section at DTU Physics and the Composites and Materials Mechanics section at DTU Wind.

Salary and terms of employment
The appointment will be based on the collective agreement with the Danish Confederation of Professional Associations. The allowance will be agreed upon with the relevant union.

The period of employment is 2 years. The intended start date is 1st February 2021 or as soon as possible hereafter.

The place of work is DTU Physics at Risø Campus in Roskilde.

You can read more about career paths at DTU here

Further information

Further information may be obtained from Senior Researcher Mayank Jain, maja@dtu.dk, +45 4677 4909. 

You can read more about DTU Physics at www.fysik.dtu.dk/english.

Application procedure
Please submit your online application no later than 25 November 2020 (local time)Applications must be submitted as one PDF file containing all materials to be given consideration. To apply, please open the link "Apply online", fill out the online application form, and attach all your materials in English in one PDF file. The file must include:

  • Application (cover letter)
  • CV
  • Diploma (MSc/PhD)
  • List of publications

Candidates may apply prior to ob­tai­ning their PhD degree but cannot begin before having received it.

The assessment of the applicants will be made by Dr. Mayank Jain (DTU Physics) and Prof. Bent F. Sørensen (DTU Wind).

Applications and enclosures received after the deadline will not be considered.

All interested candidates irrespective of age, gender, race, disability, religion or ethnic background are encouraged to apply.

DTU Physics
At DTU Physics, we carry out cutting-edge research in modern physics, with particular focus on four main areas: quantum technology, sustainable energy, materials, and biophysics. Our focus is both to acquire greater knowledge about basic scientific problems and to conduct research oriented towards use in societies and companies.

Technology for people
DTU develops technology for people. With our international elite research and study programmes, we are helping to create a better world and to solve the global challenges formulated in the UN’s 17 Sustainable Development Goals. Hans Christian Ørsted founded DTU in 1829 with a clear vision to develop and create value using science and engineering to benefit society. That vision lives on today. DTU has 12,000 students and 6,000 employees. We work in an international atmosphere and have an inclusive, evolving, and informal working environment. Our main campus is in Kgs. Lyngby north of Copenhagen and we have campuses in Roskilde and Ballerup and in Sisimiut in Greenland.