Vacuum tube.
This is an Eimac 4-65A/8165 radio tube that contains a thoriated tungsten (i.e. radioactive) electrode. They are quite common actually, or at least used to be when vacuum tubes in general were common.
Source: MDB Ventures
Contributor: Theodore Gray
Acquired: 7 August, 2004
Price: $30
Size: 3"
Purity: 2%
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