With a view to applying the copolymerization of acrylamide with acrylamide-glyoxal condensate to the stabilization of liquid radioactive wastes into gel for safe disposal or storage, several experiments were carried out on the influence of typical chemical components of the wastes on the copolymerization. The results were promising, and it was deduced that many of the liquid wastes such as the concentrates from evaporation and chemical sludges from flocculation processes could be transformed into stable polymer gels without any operational difficulties using a small quantity of gel-forming reagents.
The leachability of radionuclides and their leaching processes from crosslinked acrylamide polymer gels suspending radioactive chemical precipitates were investigated. The result was that 60Co and 106Ru, and 187Cs were almost all fixed in the gels with iron hydroxide sludge and with nickel ferrocyanide respectively, while 90Sr in the gel with calcium carbonate was a little liable to leach out. The leachings of radioactivity were estimated to be based on the diffusion out of active colloids, and their diffusion constants were determined.
A method has been developed to determine the potassium content of ashed vegetation sample in the presence of high sodium content by non-destructive neutron activation analysis. Potassium acid phthalae and sodium bicarbonate were used as the standard materials for potassium and sodium, respectively. The induced activities of the standard materials or samples were measured using a C-M counter and thick or thin aluminum absorbers. The relationship between the difference of the counting rates through the two absorbers and the weight of each standard material was established. The relevancy between the ratio of the counting rates through the two absorbers and the ratio of the weight of both standard materials was also determined. Using these relationships the potassium content of vegetation samples having high sodium-potassium ratios was determined. This method was applied to the analysis of vegetation for environmental monitoring.
Deposition loss of particles in air sampling conduit causes the error in estimation of aersol concentration in air. This paper describes the calculation on deposition loss in a straight conduit caused by the gravitational settling and the thermal diffusion in laminar flow and the eddy diffusion in turbulent flow and discusses air flow rates in a conduit for minimizing the deposition loss. The calculation using a computer was made based on the semiempirical equations for the deposition loss formulated by other authors. The results show that the deposition loss for particles of 1g/cm3 density and 1μ diameter in a conduit of 2cm diameter and 10, 000cm long is within 10% in the flow rate of 40 to 400l/min (Reynolds number 3, 000-30, 000).