Contact preclusion is a fuzing feature found in some nuclear weapons in which backup contact fuzes in a nuclear weapon can be disabled when the weapon is set to air burst fuzing.
When a nuclear attack is planned, the planner has the option of deciding if either air burst or ground burst fuzing will be used. Air burst has a larger damage radius against soft targets such as personnel or non-hardened buildings than ground bursts due to the Mach stem effect, however in the event the air burst fuze fails to actuate a contact fuze as backup is often included in the weapon. Though the damage radius will be reduced in this event, it is possible the target will still be destroyed.[1]
Ground bursts produce significant fallout that has the potential to be hazardous to civilians and friendly personnel.[1] Therefore, in some weapons the option for contact preclusion exists in the weapon's fuzing. This disables the weapon's backup contact fuze, so if the air burst fuze fails, detonation is precluded, hence the name contact preclusion.[2]
^ abNational Research Council (2005). Effects of Nuclear Earth-Penetrator and Other Weapons. National Academies Press. ISBN 9780309096737. Archived from the original on 2021-05-15. Retrieved 2021-03-29.
^History of the Mk28 (Report). Sandia National Laboratories. August 1968. Archived from the original on 2021-07-07. Retrieved 2021-03-29.
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