Abstract

The range-energy relations for carbon ions (0.3-2.5 MeV) and for oxygen ions (0.5-5.0 MeV) have been measured with an uncertainty of less than +or-2% for the target gases N2, O2 and a tissue-equivalent gas (31.4% CO2, 2.8% N2 and 65.8% CH4). A magnetically analysed beam of ions was brought through a differential pumping system into a gas stopping cell. A single-grid ionization chamber, movable parallel to the beam axis, was used to obtain the data necessary to plot a Bragg curve. Comparisons with previous data are made.

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