In track simulation, the corresponding earth equivalent radiusof a track in a specific range is approximate to the earth curvature radiusof the latitudinal location of the target.
The target becomes a Beacon of Light to all targets within a 40 yard radius. Any heals you cast on those targets will also heal the Beacon for 100% of the amount healed.
It is found that the effects of the parameters, especially of energy, emittance, and radius on target, are serious and must be considered in the design of flash X ray radiographic machine.