Page 110 - AERB

Fig.7.7: Simulated 24 hours Integrated Ground Level Concentration of SF (µg /m ) for (a) Winter and (b) Monsoon.
3
6
Topography is shown as contour and the release
point is represented by a violet dot. Simulations have
indicated relatively high ground level concentration
around the release point mainly along the valley
indicating the flow channelling effect.

7.4.2 Synthesis, Characterization and Evaluation
of Novel Extractants for the separation of
Lanthanides and Actinides

To minimize long-term radiotoxicity of High Level
Liquid Waste (HLLW), the separation of minor actinides
and their subsequent transmutation into shorter-
lived nuclides is essential. The bis (triazinyl) pyridines
(BTP) have been identified as superior extractants for
the separation of highly radiotoxic trivalent actinides. Fig.7.8: Effect of SO -Ph-BTP on the Separation Factor
3
The BTP compounds having phenyl rings fitted with (SF) of Eu(III) over Am(III)
sulphonic acid groups are found to be aqueous soluble triazinyl pyridine extractant has been completed for
and they have sufficient hydrolytic and radiolytic evaluation of their extraction studies using mixer-
stability. In this study, extraction of Americium (Am (III)) settler. Five different aqueous soluble extractants were
and Europium (Eu (III)) together from 3M nitric acid synthesized and characterized as a part of AERB-CSRP
solution is carried out as a first step using glycosamides. project.

For the separation of Eu (III) from Am (III), the 7.4.3 Studies aimed at Man-Rem Reduction due to
synthesized BTP extractants were successfully tested
for the separation of Europium from Americium. A Liquid Waste Containing Oxalate
separation factor of more than 200 has been obtained Oxalate precipitation route is generally adopted
for the BTP extractant under 0.5M acidity (Fig. 7.8). for the reconversion of Plutonium Nitrate solutions to
Further to the evaluation, scaling up of 30g of bis- Plutonium Oxide for the tail-end purification process.

82 AERB Annual Report 2019