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Journal Articles

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

Kinoshita, Norikazu*; Nagaoka, Mika; Nakanishi, Takashi*

Science of the Total Environment, 753, p.142087_1 - 142087_10, 2021/01

 Times Cited Count:1 Percentile:29.38(Environmental Sciences)

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. The $$^{241}$$Am/$$^{239+240}$$Pu ratios in the North Pacific and South Pacific were comparable to one another, and were typical of the ratio for the Pacific. The $$^{241}$$Am distribution was influenced by the water mass at depths below 400 m. The $$^{241}$$Am data support the view there is a current flowing at depths of 400-3000 m from the North Pacific through the equator to the South Pacific. 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. The different depths for the maximum concentrations of $$^{241}$$Am and $$^{239+240}$$Pu observed at some stations were well explained by the model and by the distribution of CaCO$$_{3}$$ particles. The residence time of $$^{241}$$Am in the Pacific was also estimated by using the model.

Journal Articles

Estimation of covariance matrices for nuclear data of $$^{237}Np$$, $$^{241}Am$$ and $$^{243}Am$$

Nakagawa, Tsuneo

Journal of Nuclear Science and Technology, 42(11), p.984 - 993, 2005/11

 Times Cited Count:9 Percentile:54.78(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Evaluation of Neutron Nuclear Data for $$^{2}$$$$^{4}$$$$^{1}$$Am and $$^{2}$$$$^{4}$$$$^{3}$$Am

Kikuchi, Yasuyuki

JAERI-M 82-096, 103 Pages, 1982/08

JAERI-M-82-096.pdf:3.17MB

no abstracts in English

Journal Articles

Recovery of Americium-241 from a Waste Solution of Plutonium Purification

;

Journal of Nuclear Science and Technology, 9(4), p.237 - 240, 1972/04

no abstracts in English

Journal Articles

Absolute measurements of the disintegration rates of americium-241 sources by using semiconductor detectors

; Hiroyuki Tamura*; Yoshifumi Sakurai*

Journal of Nuclear Science and Technology, 1(3), p.101 - 107, 1964/00

no abstracts in English

Journal Articles

Radiochemical determination of plutonium isotopes and americium-241 in a plutonium sample

; ;

Journal of Nuclear Science and Technology, 1(6), p.197 - 202, 1964/00

no abstracts in English

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