Abstract
The memory effect due to the adsorption of tritium onto the electrodes of an ionization chamber sometimes reduces the accuracy of the results. Ionization chambers are generally used to monitor the tritium level in a gas stream because of their reliability, flexibility and wide range of measurement. In this paper we shown that the memory effect is mainly brought about by the transfer of tritium from the gas stream to surface water on the electrode wall by adsorption or isotope exchange reactions. A way to simulate the extent of the memory effect is proposed. An ionization chamber system which can eliminate the memory effect by applying an isotope exchange reaction is also proposed.
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