Relative Yields of Ions Produced by α-Particles in Air and Water Vapour

Details Relative Yields of Ions Produced by α-Particles in Air and Water Vapour Relative Yields of Ions Produced by α-Particles in Air and Water Vapour

Nov 1949

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1949natur.164..838a&link_type=abstract

Nature, Volume 164, Issue 4176, pp. 838 (1949).

Mathematics

Logic

4

Scientific paper

IN continuation1 of the examination of the radiological properties of water, the yield of ion-pairs in water vapour under the action of α-particles has been compared with the yield in air. A sector-shaped parallel-plate ionization chamber containing either water vapour at 95° C. or air has been exposed to a semi-collimated beam of 5.0-MeV. α-particles derived from a polonium source. A low collecting field (about 50 volts/cm.) is sufficient to produce complete saturation in both gases at pressures of 10-20 cm. of mercury, and several determinations of the relative yield of ions1 have been made. These have a mean value . Making allowance for possible systematic errors, the corresponding ratio for the energy expenditure per ion pair is taken to be the reciprocal of this figure, WH2O = 0.878 +/- 0.02. If the value of Wair for 5-MeV. α-particles is 34.7 +/- 0.5 eV.2, the value for water vapour is therefore WH2O = 30.5 +/- 0.8 eV.

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