Patent ID: 8044364

Claim:
A dosimetry device for charged particle radiation comprising: a printed circuit board having one surface and other surface opposing to each other, the one surface including a central region, and the other surface including a first portion that overlaps the central region of the one surface and a second portion positioned out side of the first portion so as to not overlap the central region; a plurality of first electrodes formed on the central region of the one surface of the printed circuit board; a spacing frame disposed on the one surface of the printed circuit board to surround the central region of the one surface; a second electrode substrate disposed on the spacing frame and having a second electrode opposing to each of the first electrodes through an ionized space; and a signal processing circuit disposed on the other surface of the printed circuit board, wherein the signal processing circuit includes a plurality of signal processing blocks each comprising: a plurality of integrating capacitors, coupled to the plurality of first electrodes, for integrating charge at each of the first electrodes; at least one amplifying circuit; and at least one selector switch that switchably connects each corresponding one of the integrating capacitors to the amplifying circuit, wherein the plurality of integrating capacitors are disposed on the second portion of the other surface of the printed circuit board.