The angular distribution of fission fragments from the neutron-induced fission of several isotopes has been studied. Distributions were observed for thermal neutrons on U233 and U235, Lady Godiva leakage neutrons on U235 and U238, and 14 Mev neutrons on U233, U235, U238, Th232, and Np237. No anisotropy was observed for thermal neutron fission, whereas for Lady Godiva neutrons and 14 Mev neutrons the probability of fission along the axis of the neutron beam was determined to be higher than for fission in the orthogonal direction. Experimental results are given on pages 10 and ll.

One characteristic of the corrosion of uranium is the accelerating destruction of the metal under both dry and humid conditions and throughout a wide temperature range. Another corrosion property is the fracturing and fragmentizing of the oxide products. This results in an accelerating or decelerating growth law being operative at a particular time. This time is determined by whether the oxide ruptures rapidly or slowly compared to the rate of growth of the unfractured oxide. The reaction with dry air is essentially a reaction with the contained oxygen. In water, under oxygen-free conditions, linear oxidation laws are observed. In steam, because UO/ sub 2/ is the product at temperatures below 250 C and U/sub 3/O/sub 8/ at temperatures above 250 C, different reaction rates occur in the two temperature ranges. The effects of a few alloying elements on the corrosion resistance of uranium are reviewed. Wartime research indicates that small additions of aluminum, molybdenum, nickel, and titanium have a slightly beneficial effect. Niobium, silicon, and zirconium increase substantially the corrosion resistance in water provided the alloy has had adequate heat treatment. There is some information that the addition of small amounts, less than 2%, of aluminum or silicon increases the …