Thallium phosphotungstate was foumd to be an excellent ion exchanger for cesium and absorbs cesium and rubidium quantitatively from large volumes of sea water. Analytical Chemistry of Cesium and Rubidium. Large isotope effects were found in Zn sad Pd- the Zn/sup 69//Zn/sup 65/ and Pd/sup 109//Pd/sup 103/ retent ion ratios are 2.8 and 1.5, respectively. There is no correlation between the retention values and the mass of the recoil atom, and variations in irradiation conditions have little influence on retention values for Pd, Cu, and Zn, while the results for Ni indicate it may be sensitive to radiation annealing. The effects of various irradiation and extraction conditions and thermal annealing on the organic retentions were studied. Szilard-Chalmers Reactions in Metal Porphines, The Szilard-Chalmers reaction was investigated in tetraphenylporphines of Co, Ni, Cu, Zn, Pd, and Ft. Some preliminary results for 45-Mev proton bombardments are discussed. Nuclear recoils from U/sup 238/ fission induced by 150-Mev protons were studied, and calculated recoil parameters and kinetic energies are presented for Cu/sup 64/, Cu/sup 64/, Ga/sup 72/, Sr/sup 91/, P d/sup 112/, Ag/sup 111/ Ag/sup 112/, Ag/sup 112/, Ag/sup 1/1/sup >/s3>s, In/sup 117//sup m/ Ba/sup 139/, and Ba/sup 140/ together with momentum transferred and deposition energies. Recoil Studies of Uranium Fission Fragments. The results indicate that a compound-nucleus mechanism is not involved. The cross section for In/sup 117//sup g/ is approximately 0.5 mb at 27 Mev and decreases somewhat with decreasing energy, while that for In/sup 117//sup m/ is -0.15 mb at 27 Mev and nearly independent of energy. lsomeric ratios were measured for the In/sup 115/ ( alpha ,2p) reaction at alpha energies of 23 to 27 Mev. Studies of the In/sup 1> / 5>s ( alpha ,2p)In/sup 117/ Reaction. (amma spectrum decay analysis gave a half life of in/sup 117//sup m/ as 1.93 plus or minus 0.04 hr and of In/sup 117//sup g/ as 38.0 plus or minus 0.5 min, in agreement with Nuclear Data Sheets but in disagreement with McGinnis' 1.1-hr value for the half life of ln/sup 117//sup g/. Cadmium metal was irradiated by 14- and 5-Mev deuterons and subjected to radiochemical separation. Isomeric ratios were measured for the ( alpha ,2p), ( alpha ,n), and ( alpha ,2n) reactions of Nb/sup 93/. The results are discussed with reference to rsnge ratios, compound-nucleus theory, and evaporation effects. Product recoil ranges are also reported for the reactions Ni/sup 58/( alpha, alpha p) and ( alpha, alpha n), Ni/sup 6 / 0>s ( alpha ,2n), Cu/sup 65/( alpha 2n) Cu/sup 63/( alpha 2n) and ( alpha ,pn), and Cu ( alpha, an) at alpha energies of 25 to 30 Mev Zn/ sup 62/ was found to have a shorter average range than Ni/sup 57/ more ยป and Co/sup 57/. The recoil rsnges of cobalt nuclides formed in alpha-irradiated manganese were measured for alpha energies of 19, 23, and 27 Mev and normalized to that of Co/sup 57/.
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