The present invention discloses a method of monitoring chemotaxis or chemoinvasion comprising: providing a device for monitoring chemotaxis. In many circumstances, the adjustment tool will be a commonly and readily available tool, such as a Philips screw driver, but it is also contemplated that an adjustment tool with a proprietary end shape can also be employed. There is a shear pin with one end embedded in the frame and the other end embedded in the socket, the shear pin defining a relatively weak shear zone located between the frame and the socket. With the present invention, a time division duplex system can transmit and receive TPC commands based on the frame correspondence information, thereby enabling correct and effective uplink power control performance. The elution supply mechanism may include an eluant supply container at least partially external to the shielded container, a conduit extending between an inlet of the radioisotope generator and an outlet of the eluant supply container, and an eluant visualization portal.