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@TECHREPORT{Horne:863091,
author = {Horne, Gregory P. and Wilden, Andreas and Mezyk, Stephen P.
and Hupert, Michelle and Stärk, Andrea and Verboom, Wim and
Mincher, Bruce J. and Modolo, Giuseppe},
title = {{R}adiolysis of {H}ydrophilic {D}iglycolamides in {A}queous
{N}itrate {S}olution},
number = {NTRD-MRWFD-2019- M3FT-19IN030102018},
school = {Idaho National Laboratory, Center for Radiation Chemistry
Research, Idaho Falls, ID, USA},
reportid = {FZJ-2019-03205, NTRD-MRWFD-2019- M3FT-19IN030102018},
pages = {21 p.},
year = {2019},
abstract = {The radiation chemistry of a series of hydrophilic DGAs
(TEDGA, Me-TEDGA, Me2-TEDGA, and TPDGA) has been
investigated under neutral pH, concentrated (5.0 M), aqueous
nitrate solution conditions. A combination of steady-state
gamma and time-resolved pulsed electron irradiation
experiments, supported by advanced analytical techniques and
multi-scale modeling calculations, have demonstrated that:
(i) the investigated hydrophilic DGAs undergo first-order
decay with an average dose constant of (3.48 ± 0.28) ×
10–6 Gy–1; (ii) their degradation product distributions
are similar to those under pure water conditions, except for
the appearance of NOx adducts; and (iii) radiolysis is
driven by hydroxyl and nitrate radical oxidation chemistry
moderated by secondary degradation product scavenging
reactions. Overall, the radiolysis of hydrophilic DGAs in
5.0 M nitrate solutions is significantly slower and less
structurally sensitive than under pure water conditions, but
similar to their lipophilic analogs. These findings are
promising for the deployment of hydrophilic DGAs as actinide
aqueous phase stripping and hold-back agents, due to the
presence of nitrate in envisioned large-scale process
conditions.},
cin = {IEK-6 / ZEA-3},
cid = {I:(DE-Juel1)IEK-6-20101013 / I:(DE-Juel1)ZEA-3-20090406},
pnm = {161 - Nuclear Waste Management (POF3-161) / GENIORS - GEN
IV Integrated Oxide fuels recycling strategies (755171) /
SACSESS - Safety of ACtinide Separation proceSSes (323282)},
pid = {G:(DE-HGF)POF3-161 / G:(EU-Grant)755171 /
G:(EU-Grant)323282},
typ = {PUB:(DE-HGF)29 / PUB:(DE-HGF)15},
url = {https://juser.fz-juelich.de/record/863091},
}