| 摘要 |
PURPOSE:To improve performance of both electrodes and more stabilize operation of X-ray multiplier tube by forming ceramic coating layer on the facing parts of an auxiliary anode and a foucsing electrode. CONSTITUTION:The figure shows data of discharge current between an auxiliary anode and the second electrode. The discharge currents are measured and recorded in such a way that the voltage between the auxiliary anode and a foucsing electrode is increased from 20kV at 2.5kV intervals and kept at each voltage for three minutes. In case of an X-ray fluorescence multiplier tube having no ceramic coating, discharge is recognized at 20kV as shown in fig. a. But in case of an X-ray multiplier tube having cermaic coating layer 8 on the facing parts of the auxiliary anode 5 and the second electrode 4, slight discharge is recognized at 35kV and a large spark-discharge is recognized at 40kV, but current is small, and base current is not so increased as the increase of voltage between the auxiliary anode and the focusing electrode, and is almost constant in no connection with voltage variation, and small as shown in fig. c. |
