Collimator helmet and sewage treatment plant: what they have in common

1. Step 1. Collimator helmet — is part of — Gamma Knife. It brings the rays to one point.
2. Step 2. Gamma Knife — uses — Radioactivity. Cobalt-60.
3. Step 3. Radioactivity — is used in — Cloud chamber. Particle tracks.
4. Step 4. Cloud chamber — is made of — Ethanol. It is saturated with alcohol or water vapour.
5. Step 5. Ethanol — uses — Fermentation. Alcohol is produced by fermentation.
6. Step 6. Fermentation — is used in — Sewage treatment plant. Activated sludge is microbes.

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