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State of Radiorhodium in High-Level Liquid Waste from Regeneration of Spent Nuclear Fuel
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Volume 57 Issue 4 Apr , pp. Volume 56 Issue 4 Apr , pp. Cambridge Research Laboratories. Purpose: To separate Rh In thin samples over a small area for X-ray counting with thin crystals.
To the active solution add 2 ml Rh N03 3 2H O carrier 1. Evaporate gently until the volume Is about 2 to 3 ml. Add 10 ml aqua regla and boil to dissolve any Insoluble oxides which may be present In the sample. Add 10 ml concentrated HC1, wash sides of beaker thoroughly with 6MHC3 and evaporate again to incipient dryness. Repeat 2-b twice to Insure complete expulsion of oxides of nitrogen. See note 1. To the chlorlde salts add 2 ml concentrated HC1 and heat slightly to dissolve.
See note 2. Total volume should be about 20 ml. Centrifuge the Iodides of tellurium and thallium. Wash the precipitate with 5 ml of a solution containing 5 ml H O, 1 ml concentra- ted HC1, 0. Add wash to main supernatant. To the combined supernatant and wash, add 10 ml concentrated HC1 and 2 ml phosphorous free HI. Boll at least 20 minutes. Keep the volume between ml by the addition of 6 M HC1.
Allow to stand a few minutes. Centrifuge 5 to 10 minutes. Discard supernatant. Boil the solution to a volume of 1 ml. Cautiously add about 3 ml of a saturated sol- ution of NaNO , with stirring. After the inltlal effervescence has subsided, place in a hot H O bath for 10 minutes with occasional stirrinE.
The radiochemistry of rhodium / by G. R. Choppin. Volume no.3008 1960 [SUPER DELUXE EDITION]
Add 1 or 2 drops of FeCl. Transfer super- n itant to a 40 ml centrifuge tube. Discard precipitate.
See note 3. Digest for 1 minute,in a hot H20 bath. Transfer supernatant to a 40 ml centri-. Acldlfy the supernatant by the addition of 1 drop 3M Hc1. Add 2 ml of a saturated solution of KNO. Stir vigorously until precipitation o2curs. Digest ina hot water bath for at least 15 minutes see Note 4. Cool to room temperature by immersing sample in cold water bath. Dissolve the precipitate with 2 or 3 ml 6M HC1 and gentle heating. Evaporate to dryness. Cool and dissolve salts with about 3 ml O.