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Radiation Protection Dosimetry 2005 115(1-4):1-9; doi:10.1093/rpd/nci152
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Nanodosimetry, from radiation physics to radiation biology

B. Grosswendt

Physikalisch-Technische Bundesanstalt, Department ‘Fundamentals of Dosimetry’, Bundesallee 100, D-38116 Braunschweig, Germany

Corresponding author: bernd.grosswendt@ptb.de

In view of the fact that early damage to genes and cells by ionising radiation starts with the early damage to segments of the DNA, it is a great challenge to radiation research to describe the general behaviour of ionising radiation in nanometric target volumes (nanodosimetry). After summarising basic aspects of nanodosimetry, an overview is given about its present state. As far as experimental procedures are concerned, main emphasis is laid on single-ion counting and single-electron counting methods, which use millimetric target volumes filled with a low-pressure gas to simulate nanometric target volumes at unit density. Afterwards, physical principles are discussed, which can be used to convert experimental ionisation cluster-size distributions into those caused by ionising radiation in liquid water. In the final section, possibilities are analysed of how to relate parameters derived from the probability of cluster-size formation in liquid water to parameters derived from radiobiological experiments.


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