Ludlum 44-9 Exposure Calibration Holder (WIP)

I created this to drop into the meter platform on our Cs-137 exposure rate calibration rig during our Ludlum 14C calibrations. The current version works pretty well as a press fit holder, but the lid is prone to breaking. Will hopefully put out a version 2 soon, but I figured I would put it here for anyone that wants a start.