| 摘要 |
PURPOSE:To improve detecting sensitivity and detecting precision, by a method wherein a alpha-rays measuring device increases a pressure of a sample. CONSTITUTION:A large number of films 2 are housed in a measuring outer casing 5 enduring a pressure. Gas to be measured, pressurized by a pump, is fed through a feed valve 6 for measuring sample, e.g., gas. A pressure to be fed is measured by a pressure gauge 8. The films 2 are made of an organic compound resin, such as white mica, polycarbonate. When the gas is pressurized into a given pressure, the valve 6 closes. After it is left in said condition for a specific period, a valve 7 opens, and after the pressure goes to an atomospheric pressure, the films 2 are taken out. The films 2 are chemical-ground by means of a specific daustic soda at 70 deg.C for about 2hr, and this produces alpha-track on the films 2. |
