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Radiation bar appears on the screen when approaching a radioactive source such as Uranium.

Radiation refers to the effects of radioactive items and objects in the game, which cause damage to the Engineer unless a Hazmat Suit is worn. While Radiation is in effect, the screen will become slightly distorted, Geiger Counter noises will be heard and a radiation level bar will appear in the upper part of the screen.

Radioactive items and objects[edit | edit source]

Currently, there are 7 types of radioactive items in game, with different amounts of radioactivity (internally referred to as ItemDecay):

Item ItemDecay Stack ItemDecay
Uranium 15 1500
Uranium Pellet 7.5 750
Encased Uranium Cell 7.5 750
Nuclear Fuel Rod 60 3000
Nuclear Waste 20 10000
Uranium resource node 10000 10000 per node
Uranium resource deposit 15 x Amount of Uranium contained (usually 54~66) About 900 per deposit

Due to the different item stack sizes, 1 stack of Nuclear Waste is the most radioactive compared to the others.

All of the items listed above glow in the dark.

Radiation levels[edit | edit source]

The formula for calculating the radiation level (intensity) is:


  • Amount of items. So 2 stacks of Uranium counted as 200.
  • Distance between the player and the item, in meters
  • 0.0125
  • : Refer to the table above.

Radiation intensity for multiple radioactive sources, such as items in different containers, are summed scalar in 3D. After the summation, the intensity level is then capped between 0.2 (0.44% radiation damage) and 45 (100% radiation damage). An engineer will not receive any damage below 0.2 intensity. Beyond 45, the radiation damage is capped, which at this intensity, kills the Engineer in 5 seconds or consumes the Iodine Infused Filter at a maximum rate of 1 per 12 seconds. In-between, the filter lasts longer as the radiation level reduces. The radiation bar in the game screen is capped at 26.7% radiation damage.

Items closer than 0.5 meters or in the inventory are counted as x = 0.5 meters

The above formula can be applied to the following situations:

Be careful when hand-mining Uranium ores, as Uranium in the inventory can kill the Engineer quickly[1], due to the short distance of x = 0.5 meter. Other creatures such as Stingers or Lizard Doggos do not take damage from Radiation.

An Uranium Deposit produces radiation of 0.44 % starting at 85 meters and of 50 % at about 19 meters. There are no values that can be placed into the above formula to calculate this radiation, but an approximation would be ItemAmount 1, ItemDecay 167800 and RadiationFallOffDistance 0.0262.

Protection[edit | edit source]

In Tier 7, a Hazmat Suit can be unlocked via its respective milestone. Having the suit on won't stop the noises, but will protect the Engineer from Radiation damage. As the suit requires Alclad Aluminum Sheets to craft, it is required to complete the Bauxite Refinement milestone first.

Entering any vehicle also stops the Engineer from taking radiation damage.

Examples[edit | edit source]

To get a feeling about how far the radiation goes, here are some examples:

Item Minimum distance without radiation damage
100 Uranium (1 Stack) 22 meters
200 Uranium Cell (1 Stack) 22 meters
50 Nuclear Fuel Rods (1 Stack) 29 meters
500 Nuclear Waste (1 Stack) 48 meters
24000 Nuclear Waste (1 Industrial Storage Container) 161 meters
96000 Nuclear Waste (4 Industrial Storage Containers) 221 meters
384000 Nuclear Waste (16 Industrial Storage Containers) 289 meters
1536000 Nuclear Waste (64 Industrial Storage Containers) 363 meters

Tips[edit | edit source]

  • Beware when disposing of radioactive items as it can currently cause a glitch, in which the area acts as if a dropped piece is still there.
  • If keeping one or more Lizard Doggos, keep them in a containment pen, in case one brings you Nuclear Waste with a conveyor system ready to handle the waste. Alternatively, kill the Lizard Doggo to delete the waste.
  • There is an online calculator to calculate radiation.
  • An alternative radiation calculator. This one allows you to upload a save game and displays the radiation map.

Current issue[edit | edit source]

There is a bug where after the engineer mined some Uranium deposits (which is usually performed to remove their radiation), followed by deleting the Uranium in the inventory, the radiation effect persists and also continuously draining the Iodine Infused Filter. To reset the radiation, save the game then reload.

References[edit | edit source]