work at HASL has involved the improvement of the physical design and the comparative testing for collection efficiency. ras ——— — | | | | || | | | | \ \ | | \ { t 4f t ) | ~ wt oN ow”, SS Se eo ee se ~ vt STEM-49 MM ID- 25MM OD THREAOED CAP a “2 as 94 z | ive | —————}y* ee cit A aa STEM-25MMID 44" 0D THREADED END CAP TAPERED TO SMALL OPENING Fig. 1— Ion-exchange fallout collector. 2 DESCRIPTION OF APPARATUS A schematic diagram of the ion-exchange fallout collector is shown in Fig. 1. This unit consists of a funnel, ion-exchange column, and leveling device —all constructed from polyethylene. The funnel is welded to a threaded cap that may be attached to the top of the ionexchange column. The bottom of the column is also threaded for a tapered cap with attached leveling tube. The funnel and tapered caps may be replaced with standard bottle caps for shipment. The collector was fabricated for HASL by Bel-Art Products, West New York, N. J. 3956