quenching

(kwĕnch′ĭng )

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1. Cooling a hot object.
2. Decreasing the energy released from a radioactive or fluorescent object.
3. The ability of any material to decrease the toxicity of a poison.
4. In MRI, the emergency release of cooling cryogens that maintain the necessary super-cooling condition of the primary magnet in order to turn off the magnetic field; used as a safety measure.

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