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Study on $$^{99}$$Mo production by Mo-solution irradiation method, 3; Activation analysis of irradiation target

溶液照射法による$$^{99}$$Mo製造に関する研究,3; 照射ターゲットの放射化分析

Huynh, T. P.*; 稲葉 良知 ; 石田 卓也; 石川 幸治*; 蓼沼 克嘉*; 石塚 悦男  

Huynh, T. P.*; Inaba, Yoshitomo; Ishida, Takuya; Ishikawa, Koji*; Tatenuma, Katsuyoshi*; Ishitsuka, Etsuo

$$^{99}$$Moを製造するための溶液照射法の照射ターゲットとして、モリブデン酸アンモニウムとモリブデン酸カリウムの2つの水溶液を選定し、水溶液中の不純物濃度を評価するためにk$$_{0}$$標準法を用いた放射化分析を実施した。この結果、始発粉末中にNa, Mn及びWの不純物が同定された。また、これらの水溶液を用いた$$gamma$$線照射下でのキャプセル等の構造材(SUS304)との両立性試験において、試験後の水溶液の放射化分析を実施した結果、同定された不純物濃度の変化がないこと,構造材から溶出した元素が検出されないことが明らかとなった。しかし、同水溶液をICPで分析した結果、構造材のわずかな腐食が認められた。

The impurity concentration in both (NH$$_{4}$$)$$_{6}$$Mo$$_{7}$$O$$_{24}$$ and K$$_{2}$$MoO$$_{4}$$ solutions, which are selected as advanced targets of Mo-solution irradiation method for $$^{99}$$Mo production, was determined by the Instrumental Neutron Activation Analysis (NAA) using k$$_{0}$$-standardization method. As a result, Na, Mn and W were identified as impurities in the as received molybdate. After the compatibility test with structural material (SUS304) under $$gamma$$-ray irradiation, activation analysis of molybdate solutions was also carried out. It was found that the identified impurity concentration was stably staying in solutions and no element comes from the structural material by the NAA method. However, small corrosion of structural material was observed from the ICP measurement.

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