Final answer:
The detection subelement of the overall site-security system includes tracking devices, calorimeters, and particle-identification detectors.
Step-by-step explanation:
The detection subelement of the overall site-security system includes several types of subdetectors. One type is the tracking device, which is designed to determine the path and momentum of a particle. Another type is the calorimeter, which measures a particle's energy. The third type is the particle-identification detector, which determines a particle's identity or mass.