Systematic measurements of the dose mean restricted LET (L 500 , D, Delta =500 eV) in air and water are reported for X-rays ranging from 10 to 300 kV p . L 500,D has been measured with a specially designed high-pressure tissue-equivalent (TE) ionization chamber. The water measurements are performed as a function of depth, field size and distance from the field edge. The experimental methods and results are described.
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Makrigiorgos et al. (1991) studied this question.
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