A SPHERICAL GRAPHITE IONIZATION CHAMBER

Chen Lishu

Nuclear Science and Techniques

pp.167-170

Published in print 01 Aug 1992

25100

This paper describes an exposure ratemeter made of graphite ion chamber. The sensitive volume is 14 cm³. The wall is 5 mm in thickness. The DC amplifier with a high input impedance consists of several stage differential amplifications, and is used for measurement of the ionization currents. Six ranges are able to cover a wide range of exposure rates. The full scale of the maximum range is 75 C/(kg • h). The lowest measurable limit is 5 mC/(kg • h). The zero drift within 8 h is less than 5% of each full scale. This instrument provides with a relatively convenient method for the measurement. The main advantages of the ionization chamber over other methods lie in rapidity and accuracy, and the change in radiation field with time can be indicated directly. It is particularly successful in acting as a routine dosimeter under high exposure rates.

High doseExposure ratemeterGamma doseSpherical ionization chamberCavity ionization chamber

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