Document: NRC Regulatory Guide
Document ID: 688895c2-d1d9-44f3-9c79-3cf0daa88510
Document Type: regulatory_guide
Title: 
Source: NRC Regulatory Guide Division 4
Source URL: https://www.nrc.gov/docs/ML0037/ML003739541.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-4.5
CFR Part: 
CFR Title: 

Content:
h a stirring rod, bring to a quick gentle boil on a hotplate, and cool. Avoid prolonged heating. 21. Passr through an anion-exchange resin column previously pretrested with SN WO3. WsA with six column volures of RN HMOs. Let the Yl'O, just pass through the column before continuing the wash with six column volumes of 12N HW. (MtM 6) 22. Mute with four column volumes of NltI-HO solution (I ml IM NHMI solution to 20 ml 12N HCO), and collect in a I 50-ml beaker. 23. Evaporate on a hotplate to 5 ml and add HMNO (70%) dropwise. PAN down the sides of the beaker dropwise with HNO9 ad add six drope of HO (38%). Evaporate to near dryness. 24. Add 50 ml of 8N HNOs solution aso epeat steps 20 through 23. using a fresh aion-exnmge resin column. (A smaller ion-exchange column may be used this time.) 25. Continue heating the sample just to dryness. Rinse down the sides of the Weaker with concentrated HC', and evaporate on a hoeplate to appmxlmately I/2 ml. The sample is now ready for electrodeposition. Notes: An appropriate quantity of Pu-236 tracer is an activity level which is within an order of magnitude of the expected activity level of Pu-239 and Pu-240 in the sample. If Pu-238 determination. is also required, it would be desirable to add no more Pu-236 tracer than the expected activity level of Pu-238 in the sample. 2. For larger soil aliquots. larger amounts of the acids (in about the same proportions) should be used. Fmi example, for a 50 suample, use 200 ml of HNO. and 100 mi of HF, etc. 3. For organic soils, first add HNO3 only, in small portions with stirring. If the solution threatens to overflow as a result of froth generation, add a few drops of octyl alcohol and stir. Digest on a hotplate until the evolution of heavy reddish-brown fumes is rodued to a barely visible level. Cool to room temperature before carefully adding HF. 4. If large centrifuge tubes are not available, it might be expeditious to perform the precipitation in a beaker fkti, to allow the precipitate