| 摘要 |
PURPOSE:To prevent a charge from being accumulated on the surface of a sample and to nearly eliminate count variation in every measurement by forming a lower cathode which is used as a sample mount in a special shape and providing another sample mount. CONSTITUTION:The sample 5 for measurement is mounted on a lower sample base 8. The sample base 8 is made of a material which contains a small amount of alpha-eay radiating elements and placed on the sample base 8 so that its measurement sample surface and cathode 4 are at an interval of 3-6mm.. An alpha-ray measuring device separates the cathode 4 and measurement sample 5 from each other and consists of an anode 3, multiple line type cathode 4, and sample base, so alpha particles radiated by the sample are emitted between the cathode and anode without boding disturbed by the diverse cathode 4 practically, thereby ionizing counter gas. Positive charges produced by the ionization are acquired by the upper cathode 2 and lower multiple line type cathode 4, so stable counting is performed without accumulating any positive charge on the sample surface practically even when the sample is a molding having no conductivity.
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