An aerosol exposure equipment was developed in order to investigate foliar uptake-translocation of radionuclides in plant. Fine and misty radioactive aerosol was generated by using an ultrasonic viblator and introduced into an exposure vessel, in which a piece of plant leaf was exposed. The radioactive mist was completely trapped by main and back up filters. Foliar uptake-translocation of60Co in bell pepper plant was studied by using the equipment. Three days after exposure the exposed leaf of the plant was washed with water. About 70% of the deposited activities was removed by washing. Only 0.5% was found in the fruit.
It has long been desired to prevent surface mateirals from cracking in a radioisotope laboratory. We applied a sheet of nonflammable wail paper, vinyl cloth, as a surface material to cover concrete wall. It was sufficiently resistant to the reinforced concrete wall cracking. The efficiency of the decontamination of the vinyl cloth was compared with those of stainless steel, iron and painted plates. The contamination and decontamination indices were determined in these surface materials after contamination with [32P] orthophosphate (pH 3, 7 and 11) for 0 to 48 h. Both of the indices of the vinyl cloth were higher than those of the other materials. Further, it was confirmed that the vinyl cloth was resistant to acid and alkaline conditions and radioisotopes could not be permeable. The wipe of efficiency was also investigated in these materials by use of several decontamination detergents. In any reagents tested, the wipe off efficiency of the vinyl cloth was more than 80%. Thus, the vinyl cloth could be used for the surface material and is. one of good surface materials in a radioisotope laboratory.
We have conducted a series of basic studies about CENTOCOR's CA125 RIA Kit, especially for the conditions of the incubation. The standard curve and the outcome of recovery test gained through the standard method and the shortening method are quite decent. As for the incubation time, it took longer than 20 hours and 6-18 hours in standard method and shortening one respectively. As our conclusion, these results suggest that shortening method can be adopted as a practical one as well as the standard method, provided that careful attention is paid to several peripheral conditions in the assay.