An emergency core cooling system comprises first and second safety divisions for an active emergency core cooling system. The processor is configured to use the absolute positions for controlling an output of the printhead during the swipe. The patches are spaced from one another so that the footwear is able to move more naturally with the expansion of the foot as pressure is applied to the foot. The first circuit also includes a higher impedance switch having a resistance of at least 1000 m\u03a9 for providing the input voltage as a voltage bypass signal. Temperature of the sensor may be recorded along with this radiation measurement for temperature compensation of ex vivo embodiments.