. ‘ ‘ . ~_ . “y i, 4 + : cabana, hlaTS ce a eaten Ba ab tak bd ite, aides ts waa ‘ nuclide Oo activity. ae Any activity detected ir blark samples represents the Contamination and equipment. con- . introduced into the sample by the Laboratory reagents The average blank walue for each nuclide with its measure of uncertainty is then subtracted from the sample activity. 1 cubic The Po-210 activity has been decay corrected for ingrowth from its Pb-210 parent for the interval between its separation date and the in day of collection. The reported error reflects the uncertainty of poth the Po-210 measurements. anno- Pb-210 and RESULTS5§5 An error in the volume computations of ten samples from the April “he 1AOSteetBAMFN ol EMI ate a 1969 mission was uncovered. The corrected radiochemical concentrations for these ten samples are given in Table 3a. The radiochemical analy- ses Of the individual and composite samples from the July 1969 miss.on are reported in Table 3b. The gross gamma and Zr-95 concentrations derived from NaI(T1) gamma spectral analyses of the October 1969 mission are given in mal Table 3c. ci- its daughter Nb-95 at counting time. Such spectra reflect the combined photopeaks Gf Zr-95 and To calculate the quantity of ax?? in this mixture, the production date of the fresh fission product de¥ bris must be known. The Zr-95 data in Table 3c were calculated on the assumption that most of the Zr-95 in each of three latitude regions of It - 13