Ludlum Model 180-14 Shield holder/collimator for 2″ NaI or similar probe

Ludlum Model 180-14 shield.  Has feet for setting down on counter providing directional response for a 44-10 or other 2″ NaI or other detector.

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Has a screw on cap holder to accomodate filters and colimators.  See the exploded photo of what comes with this.  Looks like 1/4″ thick Pb with what may be a Sn filter included for screening out low E photons.