Inert Light Sensitive Photocell

The X-ray correct, inert, light-sensitive photocell firing circuit contains all of the necessary components of an improvised explosive device (IED). The circuit is fully functional and will demonstrate that the firing switch has been activated by illuminating the LED in the blasting cap. The circuit board contains an X-ray correct battery, wire, switch, detonator, and inert explosive.

Powered by two C batteries, this IED circuit would be activated when the container holding the photodiode is opened. When the diode is exposed to light, it completes the circuit. The M112 C4 simulant is engineered to have the same density and effective atomic number (Zeff) as the real explosive threat.