Geiger counter

This is a lore summary, presenting intradiegetic or in-universe information about the subject. For game characteristics and similar data, consult the table on the right.
Game-specific articles
FalloutGeiger counter
Fallout 2Geiger counter
Fallout 3PIP-Boy 3000
FO: New VegasPIP-Boy 3000
Fallout 4Pip-Boy 3000 Mark IV
Fallout 76Pip-Boy 2000 Mark VI

Geiger counter is an essential tool for surviving in the wasteland, allowing the user to monitor the ambient radiation and their own rad count.[1][2]


A Geiger counter is a relatively simple tool, consisting of a Geiger-Müller tube connected to simple electronics. The tube contains an inert gas (helium, neon, or argon) at low pressure, which is subjected to a high voltage. The tube conducts an electrical charge for a brief moment when a particle or photon makes the gas conductive, which is amplified by the Townsend discharge effect, producing an easily measured detection pulse. This pulse is then interpreted by the onboard electronics, producing the final readout. The characteristic ticking is a common feature of counters, generated by the electronics for easy detection and monitoring of radiation.[3]


Wattz C-Radz Geiger counter

Gameplay articles:

A simple, rugged device manufactured by Wattz Electronics to detect the presence and strength of radiation fields. Includes a carrying handle and a modern, durable shell for increased portability and ease of use.[4] It's battery life is displayed in the Interface bar's ammo meter.

PIP-Boy Geiger counter

Later models of the PIP-Boy manufactured by RobCo Industries heavily miniaturized the Geiger counter, integrating it in the shell of the device.


  1. The Vault Dweller: "{125}{}{What would I need a Geiger counter for?}"
    Jake: "{127}{}{What do you need a Gieger counter for!? [Laughs] Though it's been 80 years or so since the bombs fell, there's still radiation around, you goof. You can't see it, never could, but it's there. Heck I'm willin' to bet you got some counts on you now. Everyone that lives in the wastes has a few RAD counts.}"
  2. The Vault Dweller: "{134}{}{How does a Geiger counter work?}"
    Jake: "{138}{}{It's pretty simple, actually. You use it and it tells you how many Rads you have. As long as you keep your Rad count under 100, you should be fine. Go above 100 and you're in some trouble. The worst part is you won't even know you've been sucking up Rads until a few days later. Get over 1000 and you're cooked - unless you get a hold of a whole lot of Rad-Away.}"
  3. Principle of Geiger counter operation.
  4. Fallout and Fallout 2 item description: "{5200}{}{Geiger Counter}"
    "{5201}{}{A Wattz Electronics C-Radz model Geiger Counter. Detects the presence and strength of radiation fields.}"
    (PRO ITEM.MSG (Fallout), PRO ITEM.MSG (Fallout 2))
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