Damage radii were calculated with respect to initial nuclear radiation, thermal radiation and air blast arising from a nuclear explosion. This was done at surface and air bursts with varying explosion yield. For each weapon effect, criteria were established in order for humans, within the damage radius, to become incapacitated one hour after detonation. This was done at eight different protection situations relevant from a military perspective. The study showed that at relatively low explosion yield, initial nuclear radiation was the most important weapon effect in most cases. Depending on the characteristics of the protection, the study also showed that thermal radiation or air blast was the most important weapon effect at relatively high explosion yield. The conclusion of this study was that initial nuclear radiation is important to take into account, especially at low explosion yield close to ground zero and if the individual is well protected against thermal radiation and/or an air blast.