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Annealing effect of absorbing property for Cs and CsI in fullerene investigated by synchrotron X-ray photoelectron spectroscopy

Sekiguchi, Tetsuhiro  ; Yokoyama, Keiichi  ; Yaita, Tsuyoshi

Cesium-135 having long life, 2.3 million y, that is contained in nuclear wastes may cause long-term pollution. Technology of isotopic separation of such long lived nuclide is indispensable not only for its volume reduction but also annihilation by nuclear transmutation. The recovery of atomic Cs from molecular CsI is mandatory. We have investigated fullerene C$$_{60}$$ as a potential absorber for Cs. Angle-resolved X-ray photoelectron spectroscopy, AR-XPS has been used to analyze the depth concentration distribution of Cs. Experiments were performed at soft X-ray beamline BL27A at KEK PF facility. We report on the annealing effect after deposition of Cs and the effect of heating substrate during deposition. For Cs/C$$_{60}$$ sample, the intensity ratio of Cs-3d/C-1s increased in double at the high temperature. This suggests that Cs atoms remain in the material at high temperatures. On the other hand, for CsI/C$$_{60}$$, the intensity ratio does not change much by elevating temperatures.

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