III. Results of Y-Spectral and Sr Analyses of C-Series Water Samples A. LASL Results B. LLL Results 90 IV. Results of Y-Spectral and Sr Analyses of D-Series Water Samples 76 A. LASL Results 76 B. LLL Results 90 V. Results of Y-Spectral and Sr Analyses of E-and F-Series Water Samples , 79 A. LASL Results 79 B. LLL Results 80 VI. Results of Y-Spectral Analysis of Sidewall Core Samples. 81 VII. Tritium Analyses of Pumped Water Samples 82 A. Comparison of LASL and LLL Results of T and Li Analyses of Filtered and Unfiltered B-Series Water Samples • • • • 82 B. B-Series Water Samples ..... 84 C. C-Series Water Samples 85 D. D-Series Water Samples 87 E. E-Series Water Samples 88 F. F-Series Water Samples 89 PREFACE The site of the Cambric underground nuclear test was re-entered nearly ten years after its detonation at the USERDA Nevada Test Site. The experimental results obtained from radiochemical analysis of sidewall cores and water taken during the re-entry drillback and sampling operations are summarized and discussed in this repcvt. The investigation was part of the Radionuclide Migration Project sponsored by the Nevada Operations Office of ERDA. The entire report was reviewed and modified by all three of the authors, but primary responsibility for the compilation and interpretation of the data and for writing given sections was divided among the authors as follows:

Element 104 / Rutherfordium / Liquid-liquid extraction / Transactinide chemistry / KurchatoviumAbstract Liquid-liquid extractions of element 104 (Rf), Zr, Nb, Hf, Th, and Pu(IV) were conducted using tributylphosphate (TBP) in benzene. Initial studies were conducted using 95 Zr and 95 Nb. The effect of TBP, HCl, chloride, and hydrogen ion concentrations on Zr and Nb extraction was examined. Based on the results from these experiments, it was decided to examine Rf extraction into 0.25 M TBP in benzene as a function of HCl, chloride, and hydrogen ion concentrations between 8 and 12 M. Studies of these extraction conditions were carried out using 95 Zr, 169 Hf, 228 Th, 238 Pu, and 26, Rf. The 65-second 261 Rf was produced via the 248 Cm( 18 0,5n) reaction at the 88-Inch Cyclotron at Lawrence Berkeley Laboratory. The results show that extraction for these elements increases or remains high as a function of HCl concentration. However, in the experiments in which the chloride and hydrogen ion were varied, Rf extraction differed from that of the group 4 elements and behaved more like Pu(IV).

Studies of the aqueous phase chemistry of hahnium (element 105) were performed on 34-s 262Ha produced by the 249Bk(18o,5n) reaction. The reaction products were subjected to various rapid aqueous phase chemical separation procedures. 262Ha was identified by measuring the energy and time .distribution of the alpha particles and fission fragments emitted in its decay.Time-correlated pairs of alpha particles from the decay of 262Ha and its 4.3-s daughter, 258Lr, were also measured. Hahnium was found to adhere to glass surfaces upon fuming with concentrated nitric acid, a property very characteristic of the group 5 elements, niobium and tantalum.In other experiments, the *visiting Miller Research Professor, Berkeley, spring 1987 1 extraction behavior of hahnium from mixed nitric acid I hydrofluoric acid solutions into methyl isobutyl ketone was found to be different from that of tantalum.

A new nuclide 'Ha was produced in the bombardment of a Bk target with 93-MeV "0 ions. It was detected via spontaneous fission counting and was shown to have a half-life of about 0.5 min. This activity was also separated from the reaction products by automated rapid chemical separations using cation-exchange chromatography in 0.05M a-hydroxyisobutyric acid. After chemical separation, ' 'Ha was found to decay by spontaneous fission (57+i'd%) and by a emission (E =8.35 MeV, 43%) with a half-life of 27+7 s. The spontaneous fission fragment energy spectrum is compatible with an average total kinetic energy of about 200 MeV.PACS number(s): 23.90.+w, 25.70.Jj, 25.85.Ca, 27.90.+b