‘ i Br eee a ; r ’ saiisill,it co 4 & a vv’ “We ge pron - we ° fio “owed § 4 dese en sati a 4 ko. : thee . described in Appendix A, The fon exchange colums used for the Na2h analyses are shown in Fig. 3.6. Determinations of Fe59 activities ia Fig. 3.6 Ion Exchange Columns for Sodium Analysis were attempted by gamma ray spectrometric analyses. All radiochemical samples were mounted in the center of 2 1/2 x 3 1/2 in. aluminum cards and covered with 0.45 mg/on? pliofiln. 3.4.4 Counting Techniques Counting was carried out with thin mica window GM counters mounted on Lucite stages, These stages were of the same basic endo. design as the commerical models such as RCL Mk}, Model I, modified by these Laboratories to provide an absorber shelf and to improve reproducibility of counter positioning, The stages and counters were housed in Technical Associates Model LS2 vertical lead pigs, wae, sihibilbisateuadaiiddtinetin Output was fed to Berkely 2000 sealers. The counting room in the laboratory trailer is shown in Fig. 3.7. 2h SECRET — RESTRICTED DATA