A slide type mobile terminal having a first body and a second body is provided. If the half-life of the positron emitter is greater than or equal to the selected half-life, then activating the positron emitter by bombarding the specimen with photons having energies greater than the threshold energy and detecting gamma rays produced by annihilation of positrons in the specimen. The interface member includes an elongated surface generally oriented along a longitudinal axis. A sheath having a frusto-conical rearward end extends axially from an aft end of the conical chamber. The magnetic device is positioned on the rocker at a distance from the pivotable connection.