Abstract
The W values in argon, nitrogen and methane have been measured for alpha particles with energies from 0.93 MeV to 5.3 MeV by gridded ionization chambers. The energies of alpha particles emitted from 210Po (5.3 MeV) were reduced by passage through Al foils and Mylar films of various thicknesses. The mean energies of these “reduced” alpha particles were determined using a silicon detector calibrated with five natural alpha sources. The W values for the gases and energies studied are obtained by assuming a W value of 26.31 eV in pure argon for 5.3 MeV alpha particles. The W value in argon is found to be slightly dependent on the energy of alpha particles. In nitrogen and methane, the W values for an alpha energy of 0.93 MeV are about 5 and 8% larger, respectively, than for an alpha energy of 5.3 MeV.
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