Alpha radiolysis of nitric acid and sodium nitrate with 4He2+ beam of 13.5MeV energy

Alpha radiolysis of DOTA ligand in aqueous solutions with helium ion beams

“…It has been quantified by colorimetric titration with Ti(IV). The hydrogen peroxide yields measured after radiolysis of pure water are G(H2O2)=(1.54 ± 0.17)×10 -7 mol J -1 and (1.30 ± 0.24)×10 -7 mol J -1 for 9.4 MeV and 60.7 MeV, respectively and are consistent with the yields previously measured by Garaix et al, 2015 andCostagliola et al, 2016 (Table 4). Fig.…”

“…G(X) is obtained from the slope at the origin of the curve, representing the dose dependency of the concentration of the products (Fig. 2) (Costagliola et al, 2016(Costagliola et al, , 2017Garaix et al, 2015). Data for determination of the radiolytic yields of formation of H2, CO2 and H2O2 presented in this paper are given in Supporting Information 1.…”

New insight on the simultaneous H2and HNO2production in concentrated HNO3aqueous solutions under alpha radiation

“…Another contribution to this increase could be due to less important destruction of HNO 2 by H 2 O 2 . Moisy et al 92 showed that in concentrated solutions of HNO 3 , the G(H 2 O 2 ) decreases linearly with increasing HNO 3 concentrations. H 2 O 2 is mainly formed via recombination of cOH radicals, and increased concentrations of HNO 3 will lead to cOH scavenging via reaction ( 21) and (28).…”

“…Looking at the previously reported G(HNO 2 ), our results are closest to the ones obtained for a radiolysis using plutonium nitrate in HNO 3 , 47 and rather inconsistent with measurements using helions. 92 For the a radiolysis investigations, there is a long standing debate over the use of external helions versus internal a particle emitters. This concerns the homogenous dose that is usually measured by performing a dosimetry versus the very high local dose deposited in solution in the case of external helions, and the localized dose deposition versus the calculation of the average deposited doses from the activities of the different actinides used as internal alpha sources.…”

Radioactive Wastes

“…To illustrate this model's utility, authors quantified radiolytic H2 and H2O2 production rates surrounding spent nuclear fuel under different conditions. The study demonstrates the extent to which α, and radiation contributes to total absorbed dose rate and radiolytic production rates and also the importance of including all three types of radiation in a general model of total radiolytic production rates Garaix et al, (2015). studied aqueous nitric acid solution alpha radiolysis performance through experiments carried out at a cyclotron facility, where a helion beam with an energy of 13.5 MeV could be delivered into the solution.…”