196 FOOTE resultant fallout amounts of each material as a function of date are given in Table 1, where the amounts arein millicuries per square mile. Table 1— PERIODIC FALLOUT LEVELS, I, IN MILLICURIES PER SQUARE MILE DETERMINED BY USING AN 11 BY 11 MATRIX EXCEPT AS NOTED Tos, + oy (r= lyon? Tyo (7 = 12.8 days) liste, (7 = 30 years) Tid og bimap, (T= 285 days) 314 days) 2.0 years) Dec. 22, 1962 590 325 152* 1500 61 344 June 30, 1963 855 0 182* 2380 Jan. 1, 1964 168 0 280 2030 89 106 33 0 375 1750 97 150 Date 65 days) June 30, 1964 lenin (T= Tras, (T= *Determined by use of a 10 by 10 matrix. Recent measurement of the rainfall atmospheric washout near Hattiesburg, Miss., shows fission debris from the Nov. 16, 1964, test by Communist China. About 157 mc/sq mile of “°Ba—'°La and 30 mc/ sq mile of *Zr—*°Nb washed out in the rains of Oct. 27 and 28, 1964. Also, there is an indication of dry fallout of “°Ba—'°La prior to October 27 as seen in Fig. 20. (NFALLT 0.50 Fa i + + . a ee ze SQ MILE ~. = 0.40 + oo eo Ses 0.35 o 1401o/ kK MATRIX OUTPUT & 0.55 - 0.15 0.10 : NESE ATMOSPHERIC = TEST 0.05 -0.05 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31:1 OCTOBER 1964 Fig. 20—Indication of !Ba~1'La fallout. 23 45 NOVEMBER 6 7