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The initial velocity after fission is something like 30,000 km/sec, 10 percent of the velocity of light. In moderated reactors the neutrons are slowed down by collisions with the moderator atoms and eventually (if not captured) arrive at the mean velocity of the moderator atoms themselves, or more correctly they achieve the same distribution of such velocities, which is around several km/sec depending on the moderator material and its temperature. These neutrons are then said to be thermalised as they have come into equilibrium with the thermal related moderator velocity distribution.

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