| 摘要 |
<p>PURPOSE:To obtain an ionization chamber of excellent saturation characteristic and wide measurement range, by mixing the ionized gas of a radiation detector at such a ratio as to maximize the ion mobility of the ionized gas. CONSTITUTION:A gas 4 mixed at such a ratio as to maximize the ion mobility of the gas is sealed as an ionized gas in a hermetic container. Radiation enters into an ionization chamber to ionize the gas 4 so that positive ions are collected to a cathode 2 and electrons are collected to an anode 1. As a result, a signal current is measured by an external measuring circuit. The ion mobility and mixture ratio of the gas 4 have a relationship of an inverse function to each other. A saturation range is widened by utilizing the characteristic that the ion mobility of the mixed gas 4 is higher than that of a single gas. The upper limit to the measurability of the current can thus be heightened.</p> |
