An estimate of the scale in the injury a result of the sixteen kt and 21 kt atomic bombings of Hiroshima and Nagasaki. The large temperatures and radiation induce fuel to maneuver outward radially in a thin, dense shell named "the hydrodynamic entrance". The front functions similar to a piston https://radiation-zone-of-the-sun29371.hyperionwiki.com/1297563/rumored_buzz_on_radiation_zone_definition