Cobalt-60 sources and modem: 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 — Smoke detector. Ionization detectors use americium.
4. Step 4. Smoke detector — has part — Photodiode. An optical scattering sensor.
5. Step 5. Photodiode — is used in — Fax. Scanning with a photocell.
6. Step 6. Fax — has part — Modem. It transmits an image over a telephone line.

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