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27. 2. 2018. Seminar presentation - The basics of Geant4 and possible applications

Speaker: Dr. Matti Kalliokoski, Ruđer Bošković Institute
Location: Van de Graaff seminar room, RBI
Participants: RBI and project staff

Geant4 is a C++ based simulation toolkit that is used widely in design and analysis of high energy physics experiments, in space and radiation applications, and in medical physics. It can be used to simulate the passage of particles through matter. Geant4 physics processes describe electromagnetic and nuclear interactions of particles with matter, at energies from eV to TeV. In this seminar presentation I will briefly go through the basics of Geant4 toolkit, and show some applications from various fields from accelerator physics to space environment.

Planetary gearbox under neutron irradiation.

27. 1. 2017. Seminar presentation - Alpha-screening of contaminated curved objects with flexible silicon

Speaker: Dr. Christian Schuster, University of York
Location: RBI
Participants: RBI and project staff

The detection of alpha radiation in the field can be challenging due to their short range, which is typically only some centimeters in air. This problem is exacerbated inside contaminated pipeline systems in the nuclear industry: there is currently no low cost solution available for measuring low levels of alpha-contamination, like Pu-239, inside pipes, because cutting a long pipework into segments is expensive and, therefore, incompatible for the inspection.

While previous methods mainly focused on indirect techniques, I will propose a novel approach based on a flexible sheet of 50 µm thin crystalline silicon. Following established fabrication steps of pn-junction diodes, we observe a very clear response to 5 MeV alpha-particles using a bespoke amplifier circuit. As a flexible detector offers 360-degree equidistant surface coverage and is able to adapt to the curvature of a given pipeline, I will show that our prototype device stands out as a low-cost and efficient solution for nuclear decommissioning.

Even if the sensor is aimed at the specific problem of assessing radioactive contamination in narrow pipe work, it can generally be adapted to a curved surface, such as barrels for contaminated waste. In my talk, I would like to discuss how it can also address requirements of nuclear and particle physics experiments.

Crystalline silicon wafers become flexible at ca. 70 µm thickness.

Crystalline silicon wafers become flexible at ca. 70 µm thickness. Accordingly, they can be bent to be used for screening the inner surface of a 2” diameter pipe for alpha-contamination and be mounted on an elastic inspection gauge.

2. 12. 2016. Meeting - Review of Reporting period 1

Location: RBI
Participants: RBI and project staff; Monica Hoek, EC project officer; Nora Brambilla, EC external evaluator

14. 9. 2015. Kick-off event of the project

Location: RBI