Stereotactic head frame and freezer: what they have in common

1. Step 1. Stereotactic head frame — is part of — Gamma Knife. It holds the head precisely in place.
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 — Vapour-compression cycle. The evaporation of the refrigerant produces cold.
6. Step 6. Vapour-compression cycle — is used in — Freezer. The vapour-compression cycle produces the cold.

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