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空腔电离理论和吸收剂量的定义都要求介质中的空腔足够小。但是对于特定的辐射类型、能量范围、介质和空腔内的物质以及所要求的准确度来说,大小空腔的概念却是相对的,要从理论上作一般性的定量划分当然是比较复杂和费事的,尤其是对β辐射。 本文叙述了利用空腔线度可变的组织等效外推电离室,从实验上定量地探讨了空腔电离理论,用于测量0.15到3.6兆电子伏范围内五种不同最大能量β源的吸收剂量时空腔线度的影响。确定了单位空腔体积内的电离电流在1％、5％和10％的误差以内与空腔线度无关的范
Both the cavity ionization theory and the definition of absorbed dose require that the cavity in the medium be small enough. But for a given radiation type, energy range, substance and substance in the cavity, and the required accuracy, the concept of size cavity is relative, and theoretically quantitative generalization is of course more complicated And trouble, especially for beta radiation. This paper describes the theory of cavity ionization which is quantitatively discussed by using the tissue equivalent extrapolation ionization chamber whose cavity linearity is variable. It is used to measure five different maximum energy β sources in the range of 0.15 to 3.6 MeV Effect of dose density on cavity linearity. Determine the unit cavity volume ionization current within 1%, 5% and 10% of the error within the range of cavities unrelated to