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Journal Articles

Systematic effects on cross section data derived from reaction rates in reactor spectra and a re-analysis of $$^{241}$$Am reactor activation measurements

$v{Z}$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:3 Percentile:45.99(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 $$^{241}$$Am(n, $$gamma$$) 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 $$^{241}$$Am(n, $$gamma$$) at thermal energy.

Journal Articles

Improving nuclear data accuracy of $$^{241}$$ Am and $$^{237}$$ Np capture cross sections

$v{Z}$erovnik, 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:4 Percentile:95.35

JAEA Reports

Adsorption mechanisms and models of $$^{85}$$Sr, $$^{237}$$Np, $$^{238}$$Pu and $$^{241}$$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 $$^{85}$$Sr(II), $$^{237}$$Np(V), $$^{238}$$Pu(IV) and $$^{241}$$Am(III) on the loess were investigated from their adsorption and desorption properties. The distribution coefficient of $$^{85}$$Sr and $$^{237}$$Np was 2 - 3 orders of magnitude smaller than that of $$^{238}$$Pu and $$^{241}$$Am. The adsorption of $$^{85}$$Sr and $$^{237}$$Np was mainly controlled by the ion exchange reaction. On the other hand, the adsorption of $$^{238}$$Pu and $$^{241}$$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.

Journal Articles

Accumulation and potential dissolution of Chernobyl-derived radionuclides in river bottom sediments

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:12 Percentile:62.82(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 $$^{137}$$Cs (10$$^{5}$$ - 10$$^{6}$$ Bq/m$$^{2}$$) 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 $$^{90}$$Sr (10$$^{5}$$ Bq/m$$^{2}$$ ), $$^{239,240}$$Pu (10$$^{4}$$ Bq/m$$^{2}$$ ), $$^{241}$$Am (10$$^{4}$$ Bq/m$$^{2}$$ ) 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 $$^{137}$$Cs and $$^{239,240}$$Pu is low compared with $$^{90}$$Sr in the bottom sediment, while the potential dissolution of $$^{90}$$Sr from the river bottom sediment should be taken into account with respect to the long-term radiological influence on the aquatic environment.

Journal Articles

Recent measurements of fission neutron yield data of minor actinides

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

Journal Articles

Determination of environmental Pu-241 using liquid scintillation counting techniques

Amano, Hikaru; Watanabe, Miki*

The 5th Low Level Counting Conf. using Liquid Scintillation Analysis, 0, p.86 - 91, 1996/00

no abstracts in English

JAEA Reports

None

*

PNC TN9360 93-002, 116 Pages, 1993/11

PNC-TN9360-93-002.pdf:5.14MB

no abstracts in English

Journal Articles

Effect of transplutonium nuclides on burnup reactivity changes in HCLWRs

;

Journal of Nuclear Science and Technology, 24(6), p.501 - 502, 1987/06

 Times Cited Count:3 Percentile:52.81(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Evaluation of $$^{2}$$$$^{4}$$$$^{1}$$Am Neutron Data

JAERI-M 6221, 26 Pages, 1975/08

JAERI-M-6221.pdf:0.85MB

no abstracts in English

Journal Articles

Separation of transplutonium elements from neutron irradiated americium-241, 2; Detection of berkelium and californium

; ; ;

Journal of Nuclear Science and Technology, 12(6), p.356 - 361, 1975/06

 Times Cited Count:4

no abstracts in English

Journal Articles

Separation of Curium from Neutron Irradiated Am-241

; ;

Journal of Nuclear Science and Technology, 9(2), p.113 - 115, 1972/02

no abstracts in English

Oral presentation

Measurement of neutron capture cross section of Am-241 using ANNRI-NaI(Tl) spectrometer at J-PARC

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 $$^{241}$$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 $$^{241}$$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.

Oral presentation

Estimation of effects on lung monitoring by accidental body surface contamination at Plutonium Fuel Research Facility of Oarai Research and Development Center

Takimoto, Misaki; Yamazaki, Takumi; Takada, Chie; Momose, Takumaro

no journal, , 

no abstracts in English

Oral presentation

Distribution and settling behavior of americium-241 in the tropical East Pacific

Kinoshita, Norikazu*; Nagaoka, Mika

no journal, , 

The distribution of the anthropogenic radionuclide americium-241 ($$^{241}$$Am), a decay product of $$^{241}$$Pu discharged from atmospheric tests of nuclear weapons, was investigated to resolve its horizontal and vertical migration in the Tropical East Pacific. We analyzed $$^{241}$$Am concentrations in seawater samples collected in 2003. On comparing the $$^{241}$$Am concentrations with the previously determined concentrations of $$^{239+240}$$Pu in the same samples, the vertical profiles of $$^{241}$$Am were found to be similar to those of $$^{239+240}$$Pu. At some stations, the maximum concentration of $$^{241}$$Am occurred 100-200 m deeper than that of $$^{239+240}$$Pu. In addition, the $$^{241}$$Am vertical profile was explained by using a box model that considers the decay of $$^{241}$$Pu and adsorption and scavenging by suspended particles and the residence time of $$^{241}$$Am in the Pacific was also estimated by using the model.

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