Radial Dose, LET, and W for 16 O Ions in N 2 and Tissue-Equivalent Gases

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Abstract
Average energy to produce an ion pair (.hivin.W), distance restricted and total linear energy transfer [LET] and dose as a function of radial distance D(r) from the ion''s path were measured for 41.1-MeV 16O ions in N and Rossi-type tissue-equivalent gas. Results for .hivin.W were 38.9 .+-. 0.54 eV/ion pair for N and 33.4 .+-. 0.47 eV/ion pair for tissue/equivalent gas. Results for total LET were 6507 MeV .cntdot. cm2 g-1 for tissue-equivalent gas and 6210 MeV .cntdot. cm2 g-1 for N. Results for D(r) were used to calculate similar values in tissue-like material having a density of 1 g/cm3. The range of D(r) covered was 0.2-300 nm in tissue. Results are compared with calculations based on Paretzke''s continuous slowing down model. Measured D(r) values in N were randomly distributed about the calculated values between D(r) of 0.56-286 nm. The mean deviation between the experimental and the calculated value was 1.3% (the experimental value being higher). For tissue-equivalent gas, previously measured D(r) values were also randomly distributed about the calculated values, with a mean deviation of 4% (the experimental value being lower) between 1.5-140 nm.

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