| 摘要 |
PURPOSE: To eliminate an unnecessary signal and noise by using glass containing a lead compound selected so as to restrict the unnecessary signal to a specified value. CONSTITUTION: Glass containing a lead compound selected so as to restrict an unnecessary signal to 0.1 or less per cm<2> sec is used. The composition of the glass is 30-35wt.% SiO2 , 50-57wt.% PbO, 2-10wt.% Cs2 O, 0-5wt.%ΣMgO+ CaO+SrO+BaO, 0.1-1wt.%ΣAl2 O3 +ZrO2 +TiO2 +Nb2 O5 . The ratio of Si to Pb is 2.0-2.4 in the molar ratio of SiO2 to PbO.
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