|Author||Bay, Z. ♦ Seliger, H. H.|
|Source||United States Department of Energy Office of Scientific and Technical Information|
|Subject Keyword||PHYSICS ♦ AIR ♦ ALPHA PARTICLES ♦ ATMOSPHERE ♦ ELECTRONS ♦ IONS ♦ MEASURED VALUES ♦ OXYGEN ♦ PRESSURE|
|Abstract||In the measurement of the ionization caused by alpha particles in air, recombination effects between slowly moving positive and negative ions (the latter formed by electron attachment to oxygen) have to be considered. The usual procedure in such measurements is to determine the saturation current (by extrapolation of reciprocal current versus reciprocal voltage curves to infinite field strength) according to the Jaffe theory. A paper by Wingate, Gross, and Failla casts doubt on the validity of this extrapolation technique by proposing a field-independent part of the recombination amounting to 3.3% at atmospheric pressure in air. This proposal implied that all previous measurements of W alpha for air were in error by this amount and that this error was a possible cause for the reported difference (3--4%) between W values for alpha and beta particles in air. This supposedly field-independent part of the recombination was re-examined. The experimental conditions of Wingate, Gross, and Failla were approximated and their effect was not reproduced. Experiments demonstrate the validity of the usual extrapolation techniques. (auth)|
|Learning Resource Type||Article|
|Publisher Department||National Bureau of Standards, Washington, D.C.|
|Organization||National Bureau of Standards, Washington, D.C.|
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