Applications of a self-collimating BGO detector system to radiological emergency response.

The capability of a recently developed BGO detector system featuring a "self-collimating" structure to locate a point source was established by Monte Carlo simulations and by laboratory scale experiments. The detector system's capability to determine the direction of a nuclear plume resulting from a PWR1 or PWR2 type accident in stable atmospheric conditions by airborne monitoring of the 2.4 MeV photons emitted by 88Kr was established by Monte Carlo simulations.