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Report No.
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Difference in accumulation of plutonium and curium isotopes formed in americium targets irradiated in Joyo and JMTR

Onishi, Takashi  ; Koyama, Shinichi*; Yokoyama, Keisuke ; Morishita, Kazuki; Watanabe, Masashi  ; Maeda, Shigetaka   ; Yano, Yasuhide  ; Oki, Shigeo 

The burning of minor actinide (MA) elements, such as neptunium (Np) and americium (Am), in fast reactors (FRs) has been proposed to reduce the volume of high-level radioactive waste. Evaluation of the transmutation behavior of Am for a wide spectral range from thermal to fast neutrons requires experimental validation based on the irradiation of Am targets with well-known isotopic compositions. Four samples each of two types of Am targets, Am-241 oxide and Am-243 oxide, were prepared and irradiated in the experimental fast reactor Joyo under fast neutron flux. Additionally, a ninth sample consisting of Am-241 oxide contained in a MgO pellet was prepared and irradiated in the JMTR under thermal neutron flux. All irradiated samples were analyzed by a radiochemical method. Indexes of the transmutation behavior such as the transmutation ratio, the ratio between burnup and accumulation of an actinide could be evaluated based on the analytical results.

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