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  • Title: Radial dose distribution for 18.3 MeV/n alpha beams in tissue-equivalent gas.
    Author: Kanai T, Kawachi K.
    Journal: Radiat Res; 1987 Dec; 112(3):426-35. PubMed ID: 3423210.
    Abstract:
    Experimental measurements of the radial restricted linear energy transfer (LETr) for alpha beams of 18.3 MeV/n in tissue-equivalent gas were presented. The radial dose distribution for the alpha beam was deduced from the restricted LET measurements. A differential W value for the alpha particle in the tissue-equivalent gas was also deduced. The result for the differential W value was 29.0 +/- 0.9 eV/ion pair. The radial dose varied according to an inverse-square function with distance from the track center for radii larger than 0.026 micron. The maximum extension of the track, the penumbra radius, as 2.73 +/- 1.67 microns, which was less than predicted by calculations (7-9 microns).
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