Abstract
An on-line method for tritium breeding measurements in lithium blankets is described. The apparatus comprizes two tiny ionization chambers (≈ 1.3 cm 3 each) separated by a common electrode holding 6LiF radiating materials. Tritium producing events due to neutron interaction with the radiating material result in triton and alpha particles flying approximately in opposite directions which can be detected by the respective ionization chambers. A coincidence scheme is incorporated to sort out real events from single events. The spatial tritium production measured with the help of the double ionization chamber in the case of a LiAlO 2 blanket having lead as a neutron multiplier and polyethylene as a moderator is compared with that of MORSE calculations.
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