Technical Rerearch Laboratory, Broadcasting Corporation of Japan
Ion current of the ionization manometer includes photoelectric emission of the ion collector by soft X-ray produced by electron bombardment at the anode, and this causes an error. Authors measured photoelectric current of the ordinary ionization manometer comparing with the Bayard type ionization manometer which has low photoelectric current by the special tube construction, and discovered that residual vacuum factor (ratio of ion current to electron current) is about 900×10
-9 at anode voltages of 200 volts and this correspond to ion. current at 1.5×10
-7 mmHg, for this rason the ordinary ionization manometer is inaccurate at order of 10
-7 mmHg.
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