MEASUREMENTS OF AIRBORNE RADIONUCLIDES 9,000 —- +4 7 + o—— + T 7° 9 12,000 -———7— 211 a T +--+ %2r—5Nb 9 ~—+ 103; o—s 1) PARTICULATE ALTITUDE, FT \ o—na MB, \ 6,000 — 9 + oO—o Mic, \ o—o GASEOUS "3! \ Ox — 3,000 }—¢ 4 wyL al 4 _| 0.2 0.3 0.4 0.5 CONCENTRATION, DIS/MIN PER CU FT | 0.6 0.7 Fig. 8—Radionuclide concentration as a function ofaltitude (Nov. 13, x= oa — 12454, TOT a ” oO a oO ~~ ac — 2 = 3 - Fl mon 3 ° mee cs Ee z 000 = us bp Gc bs z 5 a, PayO Pa - : BE ; PO re = L 100 = ey 8 fe ‘ 9 g opp a ay f dE af OE a jis gif A fe ESFe UE TE us = < a ox o z Fs £2 ~ <oc 2 — = \ thr = 40,000 -— o | ia Tarr 100,000 at 1 i tt iit 1962). B ids a) ofa Ed q Edae : Ba ey os Pay ny “4 EP aE 4 fd “ESD 2 bye a ot fq 3 BSP Pa ORS o 77 7 7 = gO EE4 a 2 : 413 : ; 4 OS gs ¥ zB o ES Rey of OSD . : BS RS Ee B= 7] 7 a ES 4 ; m RADIONUCLIDE Fig. 9—Ratios of radionuclide concentrations in the stratosphere to those near ground level in the northwestern United States in January 1964. Stratospheric samples taken at 65,000 ft at 37 to 43°N and 110°W; trophospheric samples taken at 15 ft aboveground at 47°N and 11/W.