放射線の電気点火におよぼす影響

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  • Effects of Radiation on the Electric Ignition
  • ホウシャセン ノ デンキ テンカ ニ オヨボス エイキョウ

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The ignition performance can be estimated by measuring the ignition ratio in lean mixtures of combustible gases. It can be seen that emitting of β rays from radio-isotope Fe55-59 into the sparkgap or electric ignition apparatus with battery, the degree or scattering of ratios decreases and then the ignition performance becomes more uniform and stronger. When electric discharge energy is doubled, the molecular concentration of the critically lean mixture, consisting of kerosene or decalin decreases only by 3.7∼9.4%. By emitting β radiation, however, the concentration lowers by 20.7% in maximum. As the electric discharge energy decreases, the rate of decrease in molecular concentration becomes larger, and it is approximately in proportion to logarithmic counting rates of the radiation sources. Since effects of radiation on the chemical reaction can be almost neglected in our poor radioactive sources, the authors examined the electric discharge characteristics of the ignition system using a synchroscope. The β rays decrease 30∼35% of sparking voltages and increase the maximum spark gaps of the ignition coil, and then the capacity component of coil energy decreases and the induction component has been changed. In our experiments it may be considered that the induction component succeeding the capacity component is remarkably effective to ignition.

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