Cobalt-60 sources and boiler: what they have in common

1. Step 1. Cobalt-60 sources — is part of — Gamma Knife. About 200 sources in a hemisphere.
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 — uses — Latent heat. Supersaturated vapour.
5. Step 5. Latent heat — is used in — Boiler. Evaporation needs latent heat.

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