Abstract
The linear extrapolation distance was measured for a black cylindrical control rod in a cylindrical water moderator. The radius for the moderator ranged from 5 to 15 cm and the control rod radius varied from 0.41 to 1.81 cm. The neutron pulse technique was used and the decay constant was measured for a moderator with and without a control rod. From the difference in the decay constants the extrapolation distance could be calculated. Four detectors were placed inside the moderator at different radii. This made it possible to considerably reduce the problem of higher harmonic modes. The detector disturbance caused by this procedure was not so severe as this was a difference measurement. The results are about 4– 6% lower than the theoretical results given by, for example, McKay (1960), Pellaud (1968) and Kavenoky (1978).
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