Radio-Nuclear Medicine in RAYSTATION

Job Details

Are you in the end of your studies in engineering physics, physics, medical physics or similar? RaySearch now offers a Master Thesis position within medical radiation physics at our head office in central Stockholm, starting January 2023.

We offer the following Master Thesis job: Radio-Nuclear Medicine in RAYSTATION

Radionuclide medicine is when radioactive nuclei are injected in the body and bind to tumor cells where the radioactive decay can be used for treatment, tumor imaging or both. Radionuclide therapy has been used for over a century (Radium against Leukemia or Iodine against thyroid disease). The modern version are treatments where the radioactive nuclei (often Lutetium or Yttrium) are attached to manufactured peptides engineered to bind to molecules expressed at the surface of tumor cells. Nuclear beta-decays give a highly local energy deposit ranging only mm’s into the tumor or normal tissue, effective when there are many small lesions. Simultaneous photo-emissions reach outside the patient and can be used to create a, somewhat blurry, image of the tumor distribution in the body using a SPECT/CT imager (single photon emission CT). For some treatments a diagnostic PET/CT (positron emission tomography) is acquired before treatment using a beta+ emitter attached to the very same peptide.

There is mounting evidence that more precise knowledge of the dose distribution could inform treatment decisions leading to better patient survival.

We hope that at the end of this project we have created a RayStation prototype able to extract activity maps from SPECT or PET-images, feed these into the RayStation coupled photon-electron Monte Carlo dose engine with appropriate decay spectra and compute dose rates, time integrated dose or, time permitting, biologically equivalent dose for comparison to external radiotherapy.    

Starting Your Career at RAYSEARCH

Joining RAYSEARCH as a Master Thesis Student, you will:

  • get a solid introduction to our company, products and ways of working;
  • become part of a global Swedish company with 350+ employees, head office and R&D department in central Stockholm with a chance of full-time employment after graduation;
  • join 180 well-educated and dedicated engineers who enjoy knowledge sharing, problem solving and working in teams;
  • work in a great work environment with flex hours, breakfasts, after-works and social activities;
  • work with cutting-edge technology for cancer treatment. Your daily work will contribute to improve cancer treatments for patients all over the world.

Who can apply?

Master thesis students with an interest in medical radiation physics and software development with project start January 2023.

You are interested in using your knowledge in physics and programming to contribute to our mission. You may be an experienced software developer or you may be less experienced but eager to learn. Physics skills, programming interest, summer/part time jobs within development and/or research are highly valued.


RaySearch develops innovative software solutions to improve cancer care. Over 800 clinics in more than 40 countries use RaySearch software to improve treatments and quality of life for patients. RaySearch was founded in 2000 and is listed on Nasdaq Stockholm. The headquarters is located in Stockholm, with subsidiaries in the US, Europe, Asia and Australia & New Zealand. Today we are more than 380 employees with a common vision of improving cancer care with innovative software. Our great staff is crucial for our success and we offer a fantastic working environment in modern offices, flexibility and good opportunities for development. We believe in equal opportunities, value diversity and work actively to prevent discrimination.


Raysearch imageRaySearch is advancing cancer treatment through pioneering software.

About us
RaySearch works in close co-operation with leading cancer centres, to bring scientific advancements faster to the clinical world. Today, our solutions support thousands of clinics worldwide in the fight against cancer.

Why work for us
RaySearch is a technology company with a difference – our software is a vital weapon in the ongoing battle against cancer. We help save lives through innovative software for radiation therapy, which is one of the most important forms of cancer treatment. Our success has led to rapid growth. Now we need more talented and motivated people to help us pioneer the next frontier of medicine. Joining us will give you a career boost, combined with exciting challenges and the chance to contribute to something truly worthwhile.

Training and development
Working at RaySearch, you are part of a growing company with many opportunities. Our employees’ development is crucial to our success and our offer includes internal training, study visits to clinics and individualized trainings. With our highly educated and dedicated staff, the daily work environment offers great teamwork and learning opportunities.

What we are looking for
We are frequently looking for medical physicists with clinical experience, and physicists with an interest in software development. We also offer Master thesis projects and graduate positions within physics. Our current openings are available at our career page.

Sweden, US, Latin America, UK, France, Germany, Benelux, Japan, India, Singapore, China, South Korea, Australia

Number of employees
368 globally; 193 in R&D; 1 consultant in R&D; 102 in subsidiaries

Main areas of research
Machine learning, proton therapy, radiation oncology, medical physics

Positions recently recruited for
CFO, service IT specialist, QMS manager, development master thesis positions, salesforce developer – service specialist, application specialist

Desired degree disciplines/class
Depends upon position

Eligible to work in the EU/UK

How to apply
Apply online at

Closing date
All year round

Tel +46 (0)8 510 530 00

Find Us
+46 (0)8 510 530 00
P.O. Box 3297

Get job alerts

Create a job alert and receive personalised job recommendations straight to your inbox.

Create alert