Present Status of the Experimental Determination of W-values in Gases

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  • SASAKI Shinichi
    Radiation Science Center, High Energy Accelerator Research Organization(KEK)

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  • 気体のW値測定の現状と問題点
  • キタイ ノ Wチ ソクテイ ノ ゲンジョウ ト モンダイテン

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Abstract

The experimental determinations of W-value, the average energy required to produce an ion pair by a charged particle in gases, have been attempted by many researchers since just after the discovery of radiation. From these experiments, W has become to be established in many gases, and to be known as being almost constant for electrons and protons over a wide range of energy. Still at present, however, some of gases have no established values of W, and there are few data of W for heavy charged particles(ions), which is known to show the dependence on particle energies. Some important properties of W, such as dependences of particle Z and the gas pressure, are not sufficiently clear. In this article, the present status of W is reviewed, and the problems in measurements of W are discussed.

Journal

  • RADIOISOTOPES

    RADIOISOTOPES 61 (8), 415-427, 2012

    Japan Radioisotope Association

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