Surgical Units are one of the fastest and most convenient ways to heal damage and purge radiation at a cost of five Nanites. Not all Surgical Units are kept active ; inactive Units must be activated with the use of an Activation Key.
A working Surgical Unit can make many areas of the game much easier. As noted above, most Surgical Units start the game in an incomplete condition, so you'll need these Activation Keys to give them full functionality. Blood-splattered Surgical Units are inoperative and can't be used or activated.
Since Activation Keys are fairly rare, and they can't be removed once installed, you should think carefully before installing one. Is this an area where you think you're going to need frequent healing? How near is the nearest working Surgical Unit behind you?
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