Abstract: A process for separating a radionuclide such as radioactive Cu-64 from a mixture containing the radionuclide and a precursor element from which the radionuclide is formed. A weak acid solution is prepared which contains the mixture of the radionuclide and the element. The solution is contacted with a ligand which preferentially forms a complex with the radionuclide relative to the precursor element. The radionuclide complexed to the ligand is separated from the precursor element and released from the ligand by contacting the ligand with an acid.

Abstract: A radiolabeled protein composition adapted for radiation therapy which comprises a radioisotope and a protein material containing about 6 or more percent amino acids which have a sulfhydryl-containing side chain. A method for carrying out radiation synovectomy of arthritic joints. Rhenium radiolabeled protein microspheres are administered which contain cysteine and other amino acids. A method for radiolabeling a protein composition whereby the composition is treated with a reducing agent capable of reducing disulfides to sulfhydryls prior to radiolabeling.

Abstract: A method and a generator for separating daughter radioisotope from a stock solution containing the daughter radioisotope and its parent are provided. The generator is provided with a glass adsorbent which preferentially adsorbs daughter radioisotope relative to the parent radioisotope and circulation means for withdrawing the stock solution from a reservoir, contacting the solution with the glass adsorbent to adsorb the daughter radioisotope and returning the parent radioisotope-enriched solution to the reservoir. In the process stock solution containing daughter radioisotope having a predetermined pH is contacted with the glass adsorbent to selectively adsorb the daughter radioisotope thereon and the daughter radioisotope is eluted with an eluant at a second predetermined pH. The process also includes a step of washing the glass adsorbent with a wash solution at the first predetermined pH to remove traces of the parent radioisotope from the adsorbent prior to eluting the daughter radioiotope.

Abstract: A valve cover assembly and support member having opposed slots extending downwardly from the upper end thereof and extending into the lower end of a conventional valve cover to lock the valve against rotation and hold the valve in an upright position.

Abstract: A valve cover for covering a buried valve and permitting access thereto with a two piece, rigid plastic housing having a square cross section which resists rotation in the ground. The housing is capped with a cast iron collar which fits inside the top end of the housing and has apertures in the portions engaging the housing walls through which the plastic extends to lock the collar to the housing. Adjacent the lower end of the housing are opposing apertures in the housing walls through which the pipes extend from the valve. A plurality of fingers extend outward from the housing about each aperture to form a tapering passage which will accommodate different sizes of pipes.