The standard Geiger types are:
- Thin end-window
Windowless tube
Thin side-wall
Side-window pancake
Windowless pancake
- Simple ion-chamber (thin end-window)
Simple ion-chamber (thin end-window) with guard ring
Simple ion-chamber (thin end-window) with 2 guard rings
Given that many experimenters make their own ion chambers, this is NOT an exhaustive list of variants - just the most common.