Codex Energy Radiation

Radiation

Running nuclear plants radiate, incidents leave radiation behind, and nuclear waste radiates when you carry it. Radiation is plain damage over time to living beings nearby. Lead shields it, the radiation suit protects you, and the Geiger counter shows how much reaches you. Nothing else is contaminated: no blocks, no items, no lasting zones.

Sources

Source	Strength (damage per second at the centre)	When
Fission Reactor	up to 4	Grows with the neutron flux (up to one and a half times at high flux).
Tokamak	up to 3	While the plasma burns; less with helium-3.
Little Star	4	While a star exists.
Micro Black Hole Plant	3	While the singularity forms or runs.
Hawking Reactor	4	While it starts or runs.
Meltdown site	8	Fades over 6,000 ticks.
Radiation flash	12 at once, then 6	The rest fades over 600 ticks.
Nuclear Waste you carry	0.05 per piece	While it is in your inventory.

A plant only radiates while it is formed; the radiation an incident left behind stays even when the plant is broken.

How far and how strong

Once per second (20 ticks) every source reaches out to the living beings around it:

• Reach = (6 + half the plant's size + 2 × its strength) blocks, times radiation.reachScale (default 1.0, allowed 0.25–2.0). A full-power fission reactor of the smallest size reaches about 16 blocks.
• Distance: at the centre the full strength, falling evenly to nothing at the edge of the reach.
• Shielding: the radiation travels in a straight line from the plant's centre to the being's eyes. Every shielding block on the way lets only 0.05 through, every other solid block 0.6. Glass, air and other see-through blocks let everything through.
• Suit: every worn piece of the radiation suit takes away 0.25 of the rest; all four pieces block it completely.
• Threshold: below 0.25 per second nothing happens. No exposure deals more than 8 damage.
• The damage is multiplied by radiation.strengthScale (default 1.0, allowed 0.0–4.0) and ignores ordinary armour. A green "Radiation" effect shows while you are hurt.

Players in creative or spectator mode take no damage. With radiation.enabled (default true) off or in the safety setting safety.safeMode (default false) there is no radiation at all.

Shielding blocks

These blocks count as shielding (block tag qnet:radiation_shielding; data packs can add more):

• Block of Lead and the lead blocks of other mods,
• Lead Concrete,
• Shielded Sight Glass: you can look into a reactor and stay shielded.

Sand	Gravel	Sand
Gravel		Gravel	→ Lead Concrete
Sand	Gravel	Sand

Tip

One layer of lead A single layer of lead blocks or lead concrete around a reactor room takes away 95 % of the radiation. Together with the distance that is usually enough to make a running reactor harmless from the outside.

The radiation suit

Four pieces: Radiation Suit Hood, Radiation Suit Jacket, Radiation Suit Trousers and Radiation Suit Boots. Each worn piece takes away a quarter of the radiation; the full suit takes away everything from every source. As armour it gives as little protection as leather; it is repaired with lead ingots. Carrying the full suit earns the advancement "Safety First".

	Wool
Wool		Wool	→ Radiation Suit Hood

Wool		Wool
	Wool		→ Radiation Suit Jacket
Wool		Wool

Wool		Wool
			→ Radiation Suit Trousers
Wool		Wool

Wool		Wool	→ Radiation Suit Boots

The Geiger counter

Hold the Geiger counter in either hand. Once per second the action bar shows what the radiation sources would do where you stand, added up over all of them:

Message	Meaning
Radiation: safe	Below 0.25 per second: nothing happens.
Radiation: … /s	The damage per second you would take without a suit.
Radiation: … /s – with suit: … /s	You wear suit pieces; the second number is what still reaches you.
Radiation: … /s – with suit: safe	Your suit pieces keep you below the threshold.
Radiation is switched off on this server	Radiation is off (or safe mode is on).

• The needle and the colour show the level of the rate without a suit: calm (green) below 0.25, low (yellow), high (gold) from 1, danger (red) from 4.
• The counter clicks faster the higher the level.
• It measures the field before radiation.strengthScale (default 1.0, allowed 0.0–4.0), and it also measures in creative mode.
• It shows the nuclear waste you carry as well.

			→ Geiger Counter

Carried waste

Nuclear Waste radiates whoever carries it: players by everything in their inventory, mobs by what they hold in their hands (looked at within 16 blocks of a player). Waste in a chest or any other container does nothing. See Nuclear Fuel Cycle.

Warning

Radiation goes through glass Ordinary glass and sight glass do not shield. Only Shielded Sight Glass does. A window in a reactor hall must be made of it.