Inverse-kinetics is an equation that will calculate the reactivity value for the reactor (in terms of cents). The meter should start when the reactor is critical.
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Using Arduino to Create an Online Reactor Reactivity Meter
A Digilent microcontroller board is used to perform inverse-kinetics on an input signal from neutron detectors. Current or pulse detectors can be used, but signal conditioning to obtain a signal of 0-3.3V is required. The setup only works on one range.