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Am reactor activation measurements
erovnik, G.*; Schillebeeckx, P.*; Becker, B.*; Fiorito, L.*; Harada, Hideo; Kopecky, S.*; Radulovic, V.*; Sano, Tadafumi*
Nuclear Instruments and Methods in Physics Research A, 877, p.300 - 313, 2018/01
Times Cited Count：5 Percentile：42.11(Instruments & Instrumentation)Methodologies to derive cross section data from spectrum integrated reaction rates were studied. The Westcott convention and some of its approximations were considered. The accuracy of the results strongly depends on the assumptions that are made about the neutron energy distribution, which is mostly parameterised as a sum of a thermal and an epi-thermal component. Resonance integrals derived from such data can be strongly biased. When the energy dependence of the cross section is known and information about the neutron energy distribution is available, a method to correct for a bias on the cross section at thermal energy is proposed. Reactor activation measurements to determine the thermal Am(n, 
) cross section reported in the literature were reviewed, where the results were corrected to account for possible biases. These data combined with results of time-of-flight measurements give a capture cross section 720 (14) b for Am(n, ) at thermal energy.
Am and 
Np capture cross sectionserovnik, G.*; Schillebeeckx, P.*; Cano-Ott, D.*; Jandel, M.*; Hori, Junichi*; Kimura, Atsushi; Rossbach, M.*; Letourneau, A.*; Noguere, G.*; Leconte, P.*; et al.
EPJ Web of Conferences, 146, p.11035_1 - 11035_4, 2017/09
Times Cited Count：3 Percentile：84.49(Nuclear Science & Technology)
Sr, Np, 
Pu and Am in loess media (Joint research)Tanaka, Tadao; Mukai, Masayuki; Maeda, Toshikatsu; Matsumoto, Junko; Ogawa, Hiromichi; Li, S.*; Wang, Z.*; Wang, J.*; Guo, Z.*; Zhao, Y.*
JAERI-Research 2002-034, 20 Pages, 2002/12
JAERI-Research-2002-034.pdf:1.1MB
Adsorption mechanisms and models of Sr(II), Np(V), Pu(IV) and Am(III) on the loess were investigated from their adsorption and desorption properties. The distribution coefficient of Sr and Np was 2 - 3 orders of magnitude smaller than that of Pu and Am. The adsorption of Sr and Np was mainly controlled by the ion exchange reaction. On the other hand, the adsorption of Pu and Am was mostly controlled by the selective chemical reactions with Fe and Mn oxyhydroxide/oxide and humic substances. On the basis of the experimental results, several types of adsorption models of the radionuclides, considering elemental concentrations, adsorption mechanisms and kinetics, were proposed for setting up the analytical systems of radionuclide migration in the loess media.
Sanada, Yukihisa*; Matsunaga, Takeshi; Yanase, Nobuyuki; Nagao, Seiya; Amano, Hikaru; Takada, Hideshige*; Tkachenko, Y.*
Applied Radiation and Isotopes, 56(5), p.751 - 760, 2002/04
Times Cited Count：15 Percentile：65.01(Chemistry, Inorganic & Nuclear)Areas contaminated with radionuclides from the Chernobyl nuclear accident have been identified in Pripyat River near the Chernobyl Nuclear Power Plant. The bottom sediments contained 
Cs (10
- 10
Bq/m
) within 0-30 cm depth, which is comparable to the ground soil of in the vicinity of the nuclear power plant (the Exclusion Zone). The sediments also accumulated 
Sr (10 Bq/m ), 
Pu (10
Bq/m ), Am (10 Bq/m ) derived from the accident.The comparison of these inventories with those of the released radionuclides at the accident and the experimental analysis using the selective sequential extraction of the radionuclides in the sediments suggest that the potential mobility of Cs and Pu is low compared with Sr in the bottom sediment, while the potential dissolution of Sr from the river bottom sediment should be taken into account with respect to the long-term radiological influence on the aquatic environment.
Oigawa, Hiroyuki; Shinohara, Nobuo; Mukaiyama, Takehiko; H.H.Saleh*; T.A.Parish*; W.H.Miller*; S.Raman*
Proc. of 4th Int. Information Exchange Meeting on Actinide and Fission Product Partitioning and Transm, 0, p.341 - 346, 1997/00
no abstracts in English
Amano, Hikaru; Watanabe, Miki*
The 5th Low Level Counting Conf. using Liquid Scintillation Analysis, 0, p.86 - 91, 1996/00
no abstracts in English
;
Journal of Nuclear Science and Technology, 24(6), p.501 - 502, 1987/06
Times Cited Count：3 Percentile：50.65(Nuclear Science & Technology)no abstracts in English
; ; ;
Journal of Nuclear Science and Technology, 12(6), p.356 - 361, 1975/06
Times Cited Count：4no abstracts in English
Ueno, Kaoru; ;
Journal of Nuclear Science and Technology, 9(2), p.113 - 115, 1972/02
no abstracts in English
Katabuchi, Tatsuya*; Igashira, Masayuki*; Terada, Kazushi; Kimura, Atsushi; Nakamura, Shoji; Nakao, Taro; Iwamoto, Osamu; Iwamoto, Nobuyuki; Harada, Hideo; Hori, Junichi*
no journal, ,
Measurements of the neutron capture cross sections of Am have been performed using a time-of-flight method with an NaI(Tl) spectrometer located on the ANNRI of the MLF in the J-PARC. The capture cross sections of Am were derived in neutron energies ranging from the thermal to resonance region. Comparisons of the present result with previous experimental data and evaluations were made. This contribution presents the obtained results.
Takimoto, Misaki; Yamazaki, Takumi; Takada, Chie; Momose, Takumaro
no journal, ,
no abstracts in English
Kinoshita, Norikazu*; Nagaoka, Mika
no journal, ,
The distribution of the anthropogenic radionuclide americium-241 (Am), a decay product of Pu discharged from atmospheric tests of nuclear weapons, was investigated to resolve its horizontal and vertical migration in the Tropical East Pacific. We analyzed Am concentrations in seawater samples collected in 2003. On comparing the Am concentrations with the previously determined concentrations of 
Pu in the same samples, the vertical profiles of Am were found to be similar to those of Pu. At some stations, the maximum concentration of Am occurred 100-200 m deeper than that of Pu. In addition, the Am vertical profile was explained by using a box model that considers the decay of Pu and adsorption and scavenging by suspended particles and the residence time of Am in the Pacific was also estimated by using the model.
Am Neutron Data