The invention relates a tracking method( / b) based on positioning
monitoring system in the field of measuring technology (b), comprising: a
capsule inside the body, a data recorder, a radioactive
ray prober, and a data processor, wherein the
capsule has three radioactive markers which emit positive electrons and have
annihilation radiation with
peripheral negative electrons. When positive and negative electrons disappear, two Gamma (r) photons of equal energy are emitted in opposite directions. As the radioactive prober detects the two Gamma (r) photons, the radioactive prober produces respectively two timing pulses, and then transmits the two timing pulses and
coincidence circuits to the data processor after storing the two timing pulses and the
coincidence circuits. The data processor conducts
coincidence event selection between the two Gamma (r) photons by means of a tracking
algorithm in accordance with coincidence event, calculates a focal aggregation position of true coincidence and lower coincidence circuits, and locates the position of the
capsule inside the body. The tracking method of the invention locates can accurately the position of a capsule inside
stomach and intestine based on radioactive markers.