
Hazards, Terrorism, and Weapons of Mass Destruction ◾ 35
decreases rapidly, and so does the p
0
velocity of matter W; it becomes zero when the
shock wave becomes an ordinary sound wave. If the explosion-generated shock wave
is propagated in three-dimensional space, its eect decreases with the third power
of the distance. is is the guideline adopted by German accident prevention regu-
lations, in which the safety distance (in meters) is quantied by the term
where M is the maximum amount of explosives, in kilograms, which is present in
the building or asset at any time, while f is a factor that varies, according to the
required degree of ...