Journal Article

First Measurements of Ionisation Clusters on the DNA Scale in a Wall-less Sensitive Volume

S. Shchemelinin, A. Breskin, R. Chechik, P. Colautti and R.W.M. Schulte

in Radiation Protection Dosimetry

Volume 82, issue 1, pages 43-50
Published in print March 1999 | ISSN: 0144-8420
Published online March 1999 | e-ISSN: 1742-3406 | DOI: https://dx.doi.org/10.1093/oxfordjournals.rpd.a032605
First Measurements of Ionisation Clusters on the DNA Scale in a Wall-less Sensitive Volume

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A nanodosimetric technique and first ionisation cluster spectra on the DNA scale are presented. Single radiation-induced ions are extracted through a small aperture from a wall-less sensitive volume formed in a tissue-equivalent gas; after acceleration in vacuum, the ions are counted by an electron multiplier. Low ion diffusion permits the formation of well defined tissue-equivalent sensitive volumes, down to the scale of 0.1 nm; the upper limit is of the order of a few tens of nm. Distributions of ionisation clusters deposited by a particles in sensitive volumes down to 1.1 nm x 1 nm (diameter x length) are presented, with the relevance to nanodosimetric studies on the DNA scale. Present limitations and possible improvements are discussed.

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Subjects: Nuclear Chemistry, Photochemistry, and Radiation

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