Aarkrog, Asker

Chen, Q.J.

Dahlgaard, Henning

Kolstad, A.K.

Lind, B.

Nielsen, Sven Poul

Yu, Yixuan

Since 1987, the Department of Nuclear Safety Research, Risø National Laboratory has developed procedures for analysis of low-level amounts of radioactivity in large samples of 200 liters seawater, 10 gram sediment, soil and other environmental materials.These analytical procedures provide high chemical yields, good resolution and excellent decontamination factors for large environmental samples analysed by alpha spectrometry and mass spectrometry (ICPMS). The procedures have been checked throughpractical analysis work and are used in Norway, the Netherlands, Germany, Spain, France and Denmark.A procedure for the determination of plutonium in seawater is described. Theplutonium is pre-concentrated by scavenging with Fe(OH)2 and Fe(OH)3 .This purifies for Ca2+, Mg2+ and amphoteric elements. The method is based on a new procedure in which the principle of controlled valence is applied. The redox system SO32- / NO2- was used (1) first to reduce to Pu3+ and afterwards to oxidize to Pu4+. The Pu3+ is separated from U and 210 Po by solvent extraction with TIOA – 6-10 M HCl. Followed by anion exchange of Pu4+ in 8 M HNO3. The decontamination factors of the procedure are &gt;1.7 ⋅ 106 for U and &gt;6.3 ⋅ 104 for Th. The chemical yield is 70-85%

Online Research Database In Technology

Procedures for determination of 239,240Pu, 241Am, 237Np, 234,238U, 228,230,232Th, 99Tc and 210Pb-210Po in environmental materials

http://orbit.dtu.dk/ws/files/7727225/ris_r_1263.pdf

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