When I first put on the power armor, I immediately noticed the radiation gauge. Since it's so noticeable, I thought radiation could still kill your character. However, after some trial and error, it seems that wearing power armor seems to stop radiation from having an effect on your character. That being said, what is the point of showing the gauge at all? Does it have any effect whatsoever?

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    Well, for one thing, being aware of the radiation hazard in an area is a good way to know when you shouldn't step out of your god damn power armor. Nov 19, 2015 at 1:41
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    You have incredibly high resistance with the armor on, but it's not total. I think I've taken some minor radiation damage in the glowing sea. Not confident enough to post that as an answer.
    – DCShannon
    Nov 19, 2015 at 1:48
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    ^ You CAN take radiation damage even in power armor. I can confirm I entered the glowing sea with 0 rads, never left my power armor and when I exited I had about 20% of my life red.
    – CoqPwner
    Nov 19, 2015 at 14:21

2 Answers 2


The power armor radiation gauge simply gives you an idea of what radiation is present in the surrounding environment.

It's important to be aware that, while certain things like power armor and hazmat suits greatly reduce radiation damage, nothing will completely negate all rads. If your Geiger counter is clicking, you're probably taking some amount of radiation damage.

So, this provides you two things:

  • General awareness of when radiation damage is being taken.
  • An idea of where not to step out of your power armor. (Unless you're wearing a hazmat suit underneath.)

Another thing to be aware of is that damage and max HP reduction from rads is not based on static values in the same way most other damage is. Each rad absorbed takes out 0.1% of your maximum health, regardless of how high or low your natural maximum HP value is.

Rad absorption that's displayed in a numeric form is generally in terms of "rads per second". The greatest available radiation resistance (such as what you can get with power armor) reduces most sources of radiation to "<1" rads per second.

This means you'll usually have somewhere north of 16 minutes and 40 seconds worth of survival time, before you'll have to use Aids or die, while the Geiger counter inside your power armor is clicking away. Certainly, this should be more than enough for most scenarios. But it's still important to be aware that it is a finite period.

One particularly annoying bit about the power suit's radiation gauge however is that it doesn't actually show you how much damage you're taking. Usually, it's extremely low ("<1 rads") but it would be nice to actually see that value so you can be certain.

The suit's HUD also doesn't give you a clear indicator of how much of your maximum health is currently unavailable due to radiation damage already taken. (Well, apparently there is an indicator but it's really easy to miss.) This can be particularly annoying when you are trying to judge how to effectively use your Aids to restore available HP or remove absorbed radiation.

To work around these limitations, you can go into VATS at any time by holding the normal VATS button for a half-second or so. (This works in and out of combat, regardless of whether there's anything around that can be targeted.) There, you'll see the normal health bar and radiation indicators as appropriate.

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    Besides going into VATS, I believe I recall noticing that I could see my normal health bar when I looked down a scope.
    – DCShannon
    Dec 10, 2015 at 2:46
  • @DCShannon I'll try to remember to edit that in after a sanity-check. Thanks.
    – Iszi
    Dec 10, 2015 at 15:51
  • Did you ever check on scoping in? I've hardly used power armor since that comment, as I've found myself more effective without it.
    – DCShannon
    Jan 21, 2016 at 23:17
  • IIRC I did check and it did work. But it's been awhile so I'm not sure again. D'oh!
    – Iszi
    Jan 22, 2016 at 0:30

Power armor provides powerful radiation resistance, but it does not make you immune. As such, you will still take radiation damage, though very minimal. Unless you have a perk or a modification that removes radiation from food and water, this is also a potential source of harmful radiation.

As LessPop_MoreFizz mentions, it is also helpful for identifying radiation around the player. This should hopefully ensure you do not get out of the armor in a highly radiated area, and suffer large amounts of radiation damage as a result.

Also bear in mind that different power armor suits provide varying radiation resistance. There are also modifications that provide increased endurance, which is the base stat used to determine your players radiation resistance.

  • Do we actually know that Endurance is related to radiation resistance? I recall it was in previous games, but I don't think it is here.
    – DCShannon
    Feb 1, 2016 at 19:30

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