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The 1B86 is a small self-quenched counter tube for gamma radiation. It is sensitive to high energy beta rays and above in energy and frequency.

The anode is the centre lead.

The thin glass tube envelope is 6 mm in diameter and, excluding the base wires, is 90 mm tall.

Reference: Data-sheet. Type 1B86 was first introduced in 1950. See also 1950 adverts.

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.