| 摘要 |
This invention relates to a charged particle beam-dosimeter comprising an ionization chamber which produces an ionization current having a magnitude proportional to the dose of a charged particle beam, an operational amplifier which is connected to the output side of the ionization chamber, a capacitor which is connected in parallel with the operational amplifier, and a comparator which is connected to the output terminal of the operational amplifier, wherein charges are collected in the capacitor on the basis of the ionization current having flowed from the ionization chamber, and when the output potential of the operational amplifier has become a predetermined voltage, one pulse is generated so as to be counted and simutaneously to extinguish the charges stored in the capacitor.
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