| 摘要 |
PROBLEM TO BE SOLVED: To provide a thickness gauge for multi-point measurement by means of which the difference about the sensitivity for radiation of an ionization chamber becomes small in the width direction, and a more accurate measurement of board thickness can be carried out. SOLUTION: The ionization chamber 5, which is arranged in a detecting section 2, is turned around in the clockwise or counterclockwise direction in relation to the direction in which an object to be measured 4 flows. Thereby, a low sensitive region for the radiation, i.e., dead zone, which exists in conventional arrangement of the ionization chamber, can be eliminated, and the measurement of the object to be measured 4 is carried out continuously and accurately in the width direction.
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