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The new isotope 12.3-min ' Cf was produced via the ' Cf(t,p) reaction, and a new 43-min isomer of ' Md was produced via the ' Es(a,n) reaction. The fragment mass and kinetic energy distributions from the spontaneous fission of" Cf were found to be very similar to those from the spontaneous fission of lighter Cf isotopes. The mass division is primarily asymmetric, and the average total kinetic energy is 189.8+0.9MeV. The 43-min "Md presumably decays by electron capture and provides an opportunity to study the mass and kinetic energy distributions from the spontaneous fission of. the 380-p,s Fm daughter. The observed narrow, symmetric mass distribution and the most probable total kinetic energy of 238+3 MeV are similar to those reported for the spontaneous fission of" Fm but show a sharp increase in symmetric mass division and total kinetic energy compared to Fm and the lighter Fm isotopes. No such abrupt change in properties was observed for "Cf, which, like "Fm, has 158 neutrons. The marked difference between the spontaneous fission properties of the heavier Fm isotopes and those of other spontaneously fissioning nuclides is compared to some theoretical predictions. RADIOACTIVITY, FISSIONCf (SF); measured T&~&, fragment-fragment coin; deduced TKE, mass distribution. Md; measured''~g2, . EC decay to 5 Fm (SF); measured fragment-fragment coin; deduced TKK, mass distribution.

FY-1981 laboratory and field studies related to the Radionuclide Migration project are described. Results are presented for radiochemical analyses of water samples collected from the RNM-1 well and the RNM-2S satellite well at the Cambric site. Data are included for tritium, 85 Kr, 129 I, and 36 C1. The maximum-concentration tritium peak appears to have arrived at RNM-2S near the end of FY-1981. Laboratory studies emphasize the sorptive behavior of alluvium and tuff and its dependence on mineralogy. Results from batch measurements and crushed-rock and whole-core column studies are presented. I. INTRODUCTION A field study of the distribution of radionuclides around an underground nuclear explosion cavity was initiated in 1974, about 9 yr after detonation. The goals of this Radionuclide Migration (RNM) Project were to determine the rates of migration underground in various media at the Nevada Test Site (NTS) and to determine the potential for movement both on and off the NTS of radio¬ activity from underground nuclear explosions. There was particular interest in possible contamination of water supplies. It was also envisioned that the study might provide data applicable to the underground disposal of radioactive waste.

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Laboratory studies emphasize the sorptive behavior of alluvium and tuff and its dependence on mineralogy.Results from batch measurements and crushed-rock and whole-core column studies are presented.