Frequency distributions of the energy deposition by 600 MeV protons in small volumes as a result of their traversal of a tissue-equivalent gas have been measured after the beam's passage through various thicknesses of a tissue-equivalent plastic. The pathIength examined is equivalent to 1.75 , u of unit density tissue (muscle). Comparisons of the energy deposition distribution functions after passage through 0, 5 and 21 cm of tissue-equivalent plastic (muscle) are given. Through the use of a coincidence gate, spectra depicting energy deposition due only to direct proton ionization in the gas were compared with those combined with contributions due to the nuclear interaction products.
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