Argonne National Laboratory Film Badge (ca. 1950)
I have no information about this film badge other than the fact that it obviously came from Argonne National Laboratory. I am guessing it is of very early vintage, ca. 1950, because of the relatively primitive filtration system. Approximately two thirds of the film packet was covered with a cadmium filter. With the exception of a square window for betas and low energy photons, the rest of the badge was made of tin. In the early to mid-1950s, other national laboratories began using plastic badges with multiple filters (e.g., copper, cadmium and lead) to evaluate the effective energy of the gamma rays and X-rays.
I suspect that this particular badge was not actually used but was employed for demonstration purposes—the clip has been removed and there is no film inside.
Size: 2" x 2.5"
Donated by Ron Kathren.