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Nanodosimetry and detector development

Working Group 6.52


The main objective of the working group is the measurement of the frequency distribution of ionization events over different length scales. It is an important characteristic in assessing the biological effectiveness of ionizing radiation which is used in common radiobiological models. The working group is furthermore dedicated to cross-sectional tasks of the division in the area of detector and electronics development.

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Radiation effects on biological systems depend not only on absorbed dose but also on the microscopic spatial distribution of the energy deposition. The working group investigates the local ionization density on a length scale ranging from about 10 μm down to 1 nm. This range covers the length scale starting from the size of a DNA segment with a few base pairs up to that of a cell nucleus. To this end, the working group develops and operates instruments which can measure the frequency distribution of ionization events in simulated nanometric volumes as well as the spatial distribution of ionization events along an extended particle track in micrometer sized volumes with a spatial resolution of a few nanometers. Furthermore, the working group is in charge of the development, maintenance and characterization of detectors as well as spectrometers for ionizing radiation and their readout, calibration and control electronics. These services are offered within the whole PTB and also to external clients.

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