| 摘要 |
PURPOSE:To obtain a plurality of frequencies from one chopper, by arranging at least two kinds of radiation adjusting parts at a fixed interval in a disc near the circumference thereof to increase or decrease the transmissivity of radiation. CONSTITUTION:Discs in which at least two kinds of radiation adjusting parts are arranged at a fixed interval near the circumference thereof to increase or decrease the transmissivity of radiation are laminated aligning a plurality of center lines. Here, the radiation adjusting parts of the discs are varied in the shape. Then, the use of the discs thus laminated as chopper 2 enables the generation of electrical signals in a detector 3 corresponding to radiation varied in the intensity.
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