Sato K, Abukawa J, Higuchi H, Bando S, Hamaguchi H
Radioisotopes. 1979 May;28(5):285-90. doi: 10.3769/radioisotopes.28.5_285.
Studies were made to develop the method for rapid determination of radioactive and stable cobalt in a single specimen of marine biological materials. The sample was dried, ashed, and dissolved in acid. The cobalt was extracted with 1-nitroso-2-naphthol benzene and determined by absorptiometry on the benzene phase. Then, the organic solution was evaporated to dryness, and the residue was treated with nitric-perchloric acid mixture to decompose any organic matter, and taken up with hydrochloric acid. The cobolt was extracted from the solution with TIO A-toluene, and the radioactive cobalt was determined by liquid scintillation counting on the toluene phase. Examinations were made on the chemical yield and on the decontamination factor of the fission product nuclides. Analysis were made on the marine biological samples of Urazoko Bay, Fukui prefecture. Agreement of the radioactive cobalt data between that by the present method and that by Ge(Li) gamma ray spectometry was good. Also, the stable cobalt value by the present method agreed well with that by neutron activation analysis method.
开展了相关研究以开发在单一海洋生物材料样本中快速测定放射性钴和稳定钴的方法。将样本干燥、灰化并溶解于酸中。用1-亚硝基-2-萘酚苯萃取钴，并通过苯相吸光光度法进行测定。然后，将有机溶液蒸发至干，残渣用硝酸-高氯酸混合液处理以分解任何有机物，再用盐酸溶解。用噻吩甲酰三氟丙酮-甲苯从溶液中萃取钴，并用甲苯相液体闪烁计数法测定放射性钴。对裂变产物核素的化学产率和去污因子进行了检测。对福井县浦添湾的海洋生物样本进行了分析。本方法测定的放射性钴数据与锗（锂）γ射线能谱法测定的数据吻合良好。此外，本方法测定的稳定钴值与中子活化分析法测定的值也吻合良好。
