Effect of palladium on the formation and protective properties of molybdenum-silicon coatings on niobium

Conclusions The addition of 0.5% Pd to a sinter-bonded molybdenum coating on niobium intensifies the process of formation of a Nb-Mo solid solution zone. The rates of siliconizing of an alloyed molybdenum coating and of the diffusional reaction of the resultant alloyed siticide coating with the substrate are higher than those observed with unalloyed coatings as a result of the formation of liquid eutectic interlayers containing Pd and Si. Alloying with palladium improves the oxidation and thermal fatigue resistance of MoSi₂ coatings on niobium.Translated from Poroshkovaya Mettallurgiya, No. 1(229), pp. 26–32, January, 1982.     

Dose characteristics of a mixture of uranium fission fragments

Results are presented for calculations for the different dose characteristics of fragment elements: the percentage composition of the mixture for a uranium exposure time t₀=100 days and a cooling off period =15–540 days, the time variation of the activity of the mixture for t₀, equal to 60, 100 and 150 days. The calculated data are in satisfactory agreement with the results of radiochemical analyses.The gamma constant of the mixture is essentially independent of t₀ (within the limits 60–150 days) and also remains approximately constant for values of ranging from 15–180 days.