A lock member attachment device with a needle guard installation structure includes a needle guard having a pair of fork-like attachment pieces at a basal portion thereof, and a boxlike needle receiving portion at least at an upper surface thereof. In use, the current through the third output will be substantially the inverse of the common mode current through the first and second outputs. An actuation member is operably connected to the pusher, and moves it when operated by a user. The reviewing radiologist is provided with greater insight into, and control over, patient workflow at the radiology review workstation. The reactor is operated during the subsequent control rod cycles with a respective control rod configuration which each includes a different group of control rods at least partly introduced, wherein the cardinal cycle is substantially longer than each of the subsequent control rod cycles. A first main semicircular shaped channel is defined circumferentially into the cover piece and extends in an annular fashion around the cover piece.