Possible Theses on Bragg-Peak Online Monitoring

Setup at the experimental hall Karim Laihem

Ion therapy is a very precise tool in cancer treatment because of its characteristic longitudinal dose profile (Bragg peak). To optimize the precision of ion therapy, a real-time monitoring of the longitudinal Bragg peak position is needed. A promising approach towards online range verification in ion therapy is the analysis of prompt gamma radiation emitted by several nuclear processes. In our group a proof-of-principle experiment has been carried out to demonstrate the correlation between the yield of prompt gamma ray emission and the Bragg peak postion. The project is a close international collaboration with the Jagiellonian University Krakow as well as the University of Katowice (Poland).


student working on germanium detectors Karim Laihem Beam Time Bronowice 2013

On Bragg-Peak Live Monitoring, we offer master and bachelor theses on request. Topics include

  • detector development,
  • data analysis and
  • simulation.

Most of the theses include parts from more than one of these areas. Specific subjects are presented at the Physics Day.


Ronja Hetzel


Ronja Hetzel

Medical Physics


+49 241 80 27327



Detector Development

We use a high purity Germanium detector to detect gamma rays. It is surrounded by BGO and Na(Tl) crystals, which register photons which are scattered in a Compton event. Measured is the deposited energy in the crystals. In the future also a time stamp is taken to reject delayed photons, which do not originate from a prompt reaction.

Possible tasks for you are in the development of a trigger logic for the time measurement in cooperation with the group in Cracow or in an optimization of the detector's shielding.

The long-term goal is to build a Compton camera to verify the range of protons in material at the proton therapy center in Bronowice. For this a new detector has to be developed, constructed and tested. You can contribute to all of the three steps.

Data Analysis

In April 2007, we will have a beam time in Bronowice (Poland) with our Germanium detector. In previous beam times only protons with energies up to 130MeV were studied. Now higher energies will be investigated. Your task will be to analyze the data we take there and compare them with former results. For this, your should be able to program in python.


For all our experiments a simulation in Geant4 is performed for a better understanding and comparison of measurement results. Additionally it is a good possibility to plan and optimize detectors. Your task could be to simulate the beam time in April 2017 in Bronowice or you could be part of the team developing a Compton camera for the local proton therapy center. Geant4 is based on C++, so it is advantageous if you have some experience with it.