ge winter shots. The same holds for a number of other fission products and suggests an excellent wey to conduct nuclear tests with a ninimm of exposure to the population. In additicn to all of the Limitations described in the last 2 paregraphe@ of the preceding section on air beta concentration, one must add uncertainties in the direction of fallout and its rete of descent. Meteorological trajectories (for constant altitude) are available for the tests in 1953 @) | 19570 ) and 1962 (3) but what we really need are the upper-air fallout (U.F.) trajectories which predict the deposition of fallout along the ground. Thyroid dose estimates from fission yields are given in Table 4. Table & YEAR THYR OF1951 TESTS ES F F ISS [ON KILOTON YIELD 31 APR 1952 1953 1985 —~ 1987 64 2§2 se 34 1958 1962 — $7 ? . AV. YINBANT DOSE 0.% 1.6 6.3 2.0 8.6* 1.4 1.0 These estimates oould be recesputed independently if the yields of the five tests of July. 1962 were released. yielde The sum of their fiasion* <te-be: "less than” 118 rstetons ©), but how wuch Less, a “aatiete-worth (which way not be much), Table 4 pre- tone flasion yield during July 1962. ‘There my be ‘gpsons for withholding this inforwation. * The 8.6 red dose for 1957 was estimated from the enlculated 1.0 red dose for 1962 and the air beta cencentrutions for 1962 & 1967 (eee Table 2). ® Dunning states that about 1099) k41Lotons of fission was relanéed pricr to 1959 at the Nevada test site The total Ejreton + fusion) yield for Neveda tests prior to 1959 was 1036 kilotone fission. Thus virtually all was