| 摘要 |
<p>PURPOSE: To enhance a secondary electron multiplication factor of a secondary electron multiplying electrode used in a photomultiplier by forming an intermediate layer mainly composed of magnesium oxide on a metallic backing board, and forming an antimony layer on it. CONSTITUTION: In a secondary electron multiplying electrode used in a dynode having a circular gauge structure of a side-on type photomultiplier, an intermediate layer mainly composed of magnesium oxide is interposed between a backing board and an antimony layer. A nickel plate and a copper beryllium alloy plate are particularly preferable as the backing board, and even an aluminium plate and a stainless steel plate fulfill a sufficient effect to improve a secondary electron emitting effect. Even when oxidation treatment is performed on an alloy plate with silver or a surface of the backing board, an improvement in a secondary electron multiplication factor by an intermediate layer of magnesium oxide can be confirmed.</p> |
