| 摘要 |
PURPOSE:To realize a highly sensitive induction coupling plasma mass spectroscope without shortening the life of a secondary photomultiplier tube. CONSTITUTION:An induction coupling plasma mass spectroscope excites a sample using a high frequency induction coupling plasma and introduces ions generated to a secondary photomultiplier tube to detect so that elements to be measured are analyzed in a gas sample and an aqueous solution sample. A secondary photomultiplier tube 19 is provided having a plurality of secondary electron release electrodes connected thereto through a resistance, a negative high voltage power source means 19a which applies a negative high voltage to the secondary electron release electrode at the initial stage of the secondary photomultiplier tube 19 and a variable voltage means 19b which is arranged between the positive voltage side of the negative high voltage power source means 19a and the final stage of the secondary photomultiplier tube 19 to generate a desired voltage. |
