Table 6 (Cont'd) Sample Collection Date 12-3-55 12-3-55 11-26-74 Days Post- Deconation 642 642 7575 Utirik, pCi guia 60¢, 1255, 1.9x107! - - 1.6x107! 4.0x1073 - 1.6xl1075 7575 7575 8240 2.0x107! 9.4x1072 1.8x107! - 5-8-77 8469 - - 10-13-77 10-13-77 10-14-77 8627 8627 8628 1.3x107! - - 1.3x107! ~ 10-13-77 10-14-77 10-14-77 8240 1.6x107! 8627 1.1xi07! 8628 8.6x1072 8628 1.6xl0-4 3.5x107> - 11-26-74 11-26-74 9-21-76 9-21-76 137¢, 1297 3.7x107> 5.4x1074 2.3x1072 1.8x10° - 2.2x109 155eu - 2.5xi07! =1.4x10° 2.2x109 2.8x10° 2.4x107! - 1.7x1072 6.7x107! - 2.0x1072 5.7x107© l.lxl07> 1.6x109 9.0x107! 7.0x107! l.lxl07> 1.6x109 - 9.6x107© - 2.3x1072 7.8x1071 1.2x100 3.2x100 - - - - “Multiply by 0.037 to obtain Bq gui, islands after all of the fallout was on the ground. The fallout decay exponent was assumed by us to be ~1.2 in order to extrapolate activity present on March 8, 1954, back to activity present on March 1, 1954. The exponent, -1.2, is the theoretical value for mixed fission products and is considered suitable for estimating the correspondence of I soil results with other measuregents. At Utirik, the focal fallout activity per unit mass of soil was 7.8 x 10° Bq g_ (0.21 uCi g*) at 1.5 days post-detonation. The ratio of nuclide activity per unit mass of soil to the total beta activity per unit mass of soil was tabulated in Table 7, column B. This ratio applies at the times of cessation of fallout. The values in column B were compared to values estimated from measurements on actual BRAVO fallout and those estimated by calculation using hypothetical undisturbed fission product yield data. These estimates for BRAVO fallout activity ratios and those for hypothetical undisturbed fission products were determined as follows. 5. The Ratio of Nuclide Activity to Fission Product Activity for Thermonu- clear Fission. Nuclide activity relative to total fission product activity was estimated from data on thermonuclear fission of 738y given by Crocker (Cr65). Total activity values given by Crocker do not account for chemical and physical deletion or enhancement of fission products, production of activation products, or production of transuranics. Total activity per 10,000 fissions at 0.5 and -~14-