Xeroradiographyの静電センシトメトリーに関する研究

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Image characteristics inherent to Xeroradiography were investigated in combination with exposure and surface voltage of the selenium plate, which allowed us an easy way to predict the surface voltage merely with the result of the visibility of glass beads, which therefore, did not requires an actually measurement. The results obtained by this study are summarized as follows : 1) It was comfirmed that the surface voltage was reduced according to the exponential low, when the selenium plate was exposed to the radiation with uniform intensity, as follows in which, V=V_<0e>^<-R/R_0> where, V_0 was the initial uniform potential, V was the surface potential vs. exposure R. R_0 was the constant required to reduce the voltage down to 1/e of its initial voltage. 2) When sensitivity S of the selenium plate was reffered to as S=R^<-1>, its maximum value was obtained at approximately 40 keV. 3) Fatouros reported that the developed image density could be approximated by the next formula : D=D_0 (D_∞-D_0)e^<-R/R_0> D was the optical density, D_0 and D_∞ were the densities under a given set of development conditions for zero and for infinite exposure. The formula will enable us to predict image density at any exposure only using the experimentally determined values of D_0 and D_∞. Practical density, however, was higher than D, about 0〜0.04,for the positive mode, and 0〜0.06,for the negative mode. This density needs to be compensated by the above values. 4) The developed image density depends to a large degree on the exposed field, if the field is smaller than an area of 1/4 the selenium plate, and also the edge effect decreases at both development modes. 5) The edge effect was maximized with the exposure around R_0. 6) The maximum perceptible diameter of minute glass beads was investigated. The visual assessment revealed that optical exposures corresponding to minute glass beads detected was as follows : Ropt (posi)=1.3R_0(Back Bias 1,600 V) Ropt (nega)=0.8R_0 (Back Bias -3,500 V) This study will make it possible to predict the values, by just knowing the R_0 s in advance, about erectrostatic sensitometry, such as surface potential, potential steps (ΔV), sensitivity and image density as well, without doing any other experiments.
公益社団法人日本放射線技術学会の論文
1982-11-01

Xeroradiographyの静電センシトメトリーに関する研究

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