PhD scholarship in dosimetry for low energy x-rays

DTU Nutech
Wednesday 12 Jul 17

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DTU Nutech, the Radiation Physics Division, is seeking candidates for a PhD position to develop a dosimetry system for low energy kV x-rays used in radiation processing.

The Radiation Physics Division carries out research, innovation and research-based consultancy in the fields of dosimetry, luminescence physics, and neutronics, with applications within e.g. geological and archaeological dating, radiation therapy, radiation processing, radiation protection and nuclear emergency preparedness. The division presently consists of approx. 35 people including researchers, technicians and PhD students.

There is an increased interest in applications of low energy x-rays (50-200 kV) in radiation processing, including sterilization of medical devices, food irradiation, polymer modifications and sterilization of insects. In addition, kV x-rays are also used for certain types of radiotherapy. Common to this wide range of applications is the need for accurate and reliable dosimetry providing measurement traceability to national standards to ensure the quality of the irradiation and compliance with international EN/ISO standards. This has proven difficult as commonly used dosimetry systems are energy dependent in this energy range. Moreover, the microbiological kill efficiency per absorbed dose derived with current measurement dosimetry methods seems to be different for low energy x-rays compared with high energy x-rays and electrons. Detailed modelling and understanding of these often complex x-ray fields are therefore prerequisites for developing a traceable dosimetry system valid at these low energies.

Job description
This PhD project aims to develop a traceable dosimetry system that can be used on a routine basis for dose measurements in low energy x-ray applications.  The project will explore methods for determination of the energy deposited in water of complex low energy x-ray radiation fields, complemented by Monte Carlo modelling. The candidate will as a starting point explore the usability of alanine EPR dosimetry that is already used as a reference dosimeter in other beam qualities due to its robustness, small size, and little signal fading after irradiation, but other dosimetry systems might also be considered.

The successful candidate is expected to have a relevant master’s or equivalent degree in engineering or physics, preferable with a focus on ionizing radiation dosimetry. Experience with experimental techniques, metrology, or computer modelling of radiation transport is an advantage.

Approval and Enrolment
The scholarships for the PhD degree are subject to academic approval, and the candidates will be enrolled in one of the general degree programmes of DTU. For information about the general requirements for enrolment and the general planning of the scholarship studies, please see the DTU PhD Guide.

We offer
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 in radiation physics, dosimetry, radioecology and medical applications of radionuclides.
We strive for academic excellence, collegial respect and freedom tempered by responsibility. The Technical University of Denmark (DTU) is a leading technical university in northern Europe and benchmarks with the best universities in the world.

Salary and appointment terms
The appointment will be based on the collective agreement with the Confederation of Professional Associations. The allowance will be agreed with the relevant union. The period of employment is 3 years. The place of work is DTU Nutech at Risø Campus in Roskilde.

Further information
Further information may be obtained from Christina Ankjærgaard,

We must receive your online application by 15 August 2017.

Applications must be submitted as one pdf file containing all materials to be given consideration. To apply, please open the link "Apply online", fill in the online application form, and attach all your materials in English in one pdf file. The file must include:

  • A letter motivating the application (cover letter)
  • Curriculum vitae
  • Grade transcripts and BSc/MSc diploma
  • Excel sheet with translation of grades to the Danish grading system (see guidelines and excel spreadsheet here)

Candidates may apply prior to obtaining their master's degree, but cannot begin before having received it.

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

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

DTU is a technical university providing internationally leading research, education, innovation and scientific advice. Our staff of 5,800 advance science and technology to create innovative solutions that meet the demands of society; and our 10,600 students are being educated to address the technological challenges of the future. DTU is an independent academic university collaborating globally with business, industry, government, and public agencies.