Collimator helmet and incandescent light bulb: 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 — is made of — Cobalt. The sources are cobalt-60.
3. Step 3. Cobalt — is material for — Cemented carbide. A cobalt binder.
4. Step 4. Cemented carbide — is made of — Tungsten. Tungsten carbide.
5. Step 5. Tungsten — is material for — Incandescent light bulb. A tungsten filament (since 1904–1910).

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