Abstract
THE DESIRE to achieve safe automatic start-up of nuclear power reactors — especially where rapid starting of marine or airborne reactors is required — has led to attempts to measure transients in neutron flux at power levels that correspond to 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">−10</sup> , or less, of full operating power. At these levels, one uses instruments such as counters and count-rate meters, that operate on individual neutron detections. Logarithmic count-rate meters are frequently used for convenience in monitoring wide ranges of neutron flux. Furthermore, the variable most commonly used for control during reactor start-up is the time derivative of the logarithm of the neutron flux, which is by definition proportional to the reciprocal of the period.
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