Aluminum Ring Badge (1950s)

Unfortunately, I have no background information about the origins of this aluminum ring badge.  However, it is so similar to the plastic ORNL ring badge (also in the collection) that I would guess that it came from ORNL. It contains a single small circular disk of film and a circular filter (cadmium?) with a hole in the center is used to compensate for the film's over-response to low energy photons.  The hole provided the film with some response to the very lowest energy photons that would otherwise be completely stopped by the filter.

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Last updated: 07/25/07
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