Pol ce?*/cs'3” acTiviTY RATIO IN AIR. ce'*4 /cs!3? activiTY RATIO 100 OO a ee OO A DO 90 * = 30 | <p 4 Ratio at t=O — o Soviet October 20 — & Debris other than c from Hardtock or High Altitude poe = - ' a High Altitude o — Oo S £ - oO = * = 2 i f A v 8 “ A A . A ~~ . A "| Hordtack I -—+4 Ae | z 4 i pHordtock |g ptt JFMAMJJASONDJFMAMJJASONDJFMAMJJASONDJ 1958 1959 1960 Fig, 8 -- The cel cg 8! activity ratio of air borne radioactivity 7"