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Journal Articles

Monte Carlo modelling for the ${it in vivo}$ lung monitoring of enriched uranium; Results of an international comparison

Broggio, D.*; Bento, J.*; Caldeira, M.*; Cardenas-Mendez, E.*; Farah, J.*; Fonseca, T.*; Konvalinka, C.*; Liu, L.*; Perez, B.*; Capello, K.*; et al.

Radiation Measurements, 47(7), p.492 - 500, 2012/07

https://doi.org/10.1016/j.radmeas.2012.04.020
 Times Cited Count：23 Percentile：83.88(Nuclear Science & Technology)

Journal Articles

Hydroxyl radical, sulfate radical and nitrate radical reactivity towards crown ethers in aqueous solutions

Wan, L. K.*; Peng, J.*; Lin, M.; Muroya, Yusa*; Katsumura, Yosuke*; Fu, H. Y.*

Radiation Physics and Chemistry, 81(5), p.524 - 530, 2012/05

https://doi.org/10.1016/j.radphyschem.2012.01.025
 Times Cited Count：16 Percentile：75.38(Chemistry, Physical)

Rate constants of common crown ethers ((C$$_{2}$$H$$_{4}$$O)$$_{n}$$, n=4, 5, 6) and their model compound, 1,4-dioxane(6C2) with some important oxidative radicals, $$^{cdot}$$OH, SO$$_{4}^{cdot-}$$, and NO$$_{3}^{cdot}$$ were determined in various aqueous solutions using pulse radiolysis and laser photolysis techniques. The rate constants for 6C2 and crown ethers with $$^{cdot}$$OH and SO$$_{4}^{cdot-}$$ increase with the number of H-atom in the ethers, indicating that H-abstraction is dominant reaction between crown ethers and these two radicals. The presence of cations in solution has negligible effect on the rate constants for $$^{cdot}$$OH and SO$$_{4}^{cdot-}$$. However, for NO$$_{3}^{cdot}$$, the rate constants is not in proportional to H-atom number in crown ethers, and the 12-crown-4 is most reactive compared with the others. For the studied crown ethers, the rate constants of these oxidative radicals have the order: $$^{cdot}$$OH $$>$$ SO$$_{4}^{cdot-}$$ $$>$$ NO$$_{3}^{cdot}$$. This is the first report on the kinetic behavior of crown ethers with NO$$_{3}^{cdot}$$, and it would be helpful for the understanding of stability of crown ethers in the nuclear fuel reprocessing.

Journal Articles

Monte Carlo modelling of Germanium detectors for the measurement of low energy photons in internal dosimetry; Results of an international comparison

G$'o$mez-Ros, J.-M.*; de Carlan, L.*; Franck, D.*; Gualdrini, G.*; Lis, M.*; L$'o$pez, M. A.*; Moraleda, M.*; Zankl, M.*; Badal, A.*; Capello, K.*; et al.

Radiation Measurements, 43(2-6), p.510 - 515, 2008/02

https://doi.org/10.1016/j.radmeas.2007.12.023
 Times Cited Count：25 Percentile：82.43(Nuclear Science & Technology)

This communication summarizes the results concerning the Monte Carlo modeling of Germanium detectors for the measurement of low energy photons arising from the "International comparison on MC modeling for in vivo measurement of Americium in a knee phantom" organized within the EU Coordination Action CONRAD (Coordinated Network for Radiation Dosimetry) as a joint initiative of EURADOS working groups 6 (computational dosimetry) and 7 (internal dosimetry).

Oral presentation

Pulse radiolysis study of liquid hydrocarbons; Observation and determination of alkyl radicals

Peng, J.; Wan, L. K.*; Lin, M.; Yan, Y.*; Muroya, Yusa*; Katsumura, Yosuke

no journal, , 

Oral presentation

Laser photolysis study on crown ether in aqueous solution

Wan, L. K.*; Peng, J.; Lin, M.; Muroya, Yusa*; Katsumura, Yosuke

no journal, , 

The transient absorption spectra of crown ethers in aqueous solution are studied using KrF (248 nm) laser photolysis. Moreover, the rate constants for the reaction of SO$$_{4}$$$$^{-.}$$ radicals with crown ethers are determined. By laser photolysis, the rate constants of the reactions of SO$$_{4}$$$$^{-.}$$ radical with 18-crown-6(18C6), 15-crown-5(15C5) and 1,4-dioxane, have been determined to be 2.5$$times$$10$$^{8}$$, 2.2$$times$$10$$^{8}$$ and 4.2$$times$$10$$^{7}$$ M$$^{-1}$$s$$^{-1}$$, respectively. The values increase with increasing the size of the ethers and K$$^{+}$$ and Na$$^{+}$$ has no obvious effect on the reactivity.

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