Finding the possible positions and calculating the activity of radioactive sources with point-kernel calculation method with build up correction in a 3D model by using doserate measurements

SCK•CEN Mentor

Vermeersch Fernand,, +32 (0)14 33 28 53

Expert group

Internal Service for Prevention and Protection at Work

SCK•CEN Co-mentor

Nijs Robby,, +32 (0)14 33 21 28


Calculation of position and source strength of radioactive sources placed in a 3D model with the use of doserate measurements based on a algorithm (for example the blind source seperation algortihm).


The objective of this thesis topic is to determine the most efficient way on the basis of a number of dose rate measurements to determine the position and strength of radioactive sources in a predictable geometry. A good measurement strategy and the selection of the fitting algorithms in relation to the the number of measurement points to determ the best possible source positions and source strength.

The goal is to integrate this methodology in  VISIPLAN 3D ALARA planning, that already has a functionality called source inference that can calculate the source strength in case we have a list of measure doserates and a correct 3D model with source positions. There is also an option to develop an external tool that will do the necessary calculations for source positon calculation and export this data to a VISIPLAN database format. In this option, no implementation of code is necessary in VISIPLAN itself.

In order to solve this problem, the blind source separation algorithm could be used.
(L Parra et al., Blind Source Separation using Generalized Eigen Value Decomposition, JMLR, 2003)

The minimum diploma level of the candidate needs to be

Master of industrial sciences , Master of sciences , Master of sciences in engineering

The candidate needs to have a background in

Informatics , Other , Physics , Mathematics